diff --git a/asm/include/main_0200C4CC.inc b/asm/include/main_0200C4CC.inc
index a1170aba..cf7f1fc6 100644
--- a/asm/include/main_0200C4CC.inc
+++ b/asm/include/main_0200C4CC.inc
@@ -750,7 +750,7 @@
 .public ADVENTURE_LOG_ENCOUNTERS_MONSTER_IDS
 .public ADVENTURE_LOG_PTR
 .public ALERT_BOX_DEFAULT_WINDOW_PARAMS
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public AREA_NAME_BOX_DEFAULT_WINDOW_PARAMS
 .public ARM9_UNKNOWN_DATA__NA_209E6BC
 .public ARM9_UNKNOWN_PTR__NA_20A2C84
@@ -816,7 +816,7 @@
 .public Debug_GetLogFlag
 .public GetDungeonModeSpecial
 .public GetEvolutionPossibilities
-.public GetFileLengthInPackWithPackNb
+.public DirectoryFileMngr_GetDirectoryFileSize
 .public GetHeldButtons
 .public GetHero
 .public GetHeroMemberIdx
@@ -859,7 +859,7 @@
 .public LANGUAGE_INFO_DATA
 .public LIFE_SEED_HP_BOOST
 .public LoadFileFromRom
-.public LoadFileInPackWithPackId
+.public DirectoryFileMngr_LoadDirectoryFile
 .public LoadOverlay
 .public MemAlloc
 .public MemArenaAlloc
diff --git a/asm/include/main_02054C24.inc b/asm/include/main_02054C24.inc
index 1192c74e..db080d15 100644
--- a/asm/include/main_02054C24.inc
+++ b/asm/include/main_02054C24.inc
@@ -189,7 +189,7 @@
 .public _s32_div_f
 .public _u32_div_f
 .public AddMoneyCarried
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public ARM9_UNKNOWN_FUNCTION_TABLE__NA_20A3CF4
 .public ARM9_UNKNOWN_TABLE__NA_20A3CC8
 .public ARM9_UNKNOWN_TABLE__NA_20A3CE4
@@ -347,7 +347,7 @@
 .public NO_SEND_ITEM_TABLE
 .public NoteLoadBase
 .public NoteSaveBase
-.public OpenAllPackFiles
+.public DirectoryFileMngr_ExtractAllDirectoryFiles
 .public ov00_022BE0C8
 .public ov01_02337B3C
 .public ov01_02337B68
diff --git a/asm/include/overlay_10.inc b/asm/include/overlay_10.inc
index a19becc2..1a528528 100644
--- a/asm/include/overlay_10.inc
+++ b/asm/include/overlay_10.inc
@@ -3,7 +3,7 @@
 .public _020B0A5C
 .public _s32_div_f
 .public abs
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public BAG_ITEMS_PTR_MIRROR
 .public CalcMenuHeightDiv8__020329E4
 .public CleanStickyItemsInBag
@@ -168,7 +168,7 @@
 .public GetDungeonGroup
 .public GetDungeonMode
 .public GetDungeonModeSpecial
-.public GetFileLengthInPackWithPackNb
+.public DirectoryFileMngr_GetDirectoryFileSize
 .public GetGameMode
 .public GetItemAtIdx
 .public GetMoneyCarried
diff --git a/asm/include/overlay_29_022DC240.inc b/asm/include/overlay_29_022DC240.inc
index cabd42be..fc0b3709 100644
--- a/asm/include/overlay_29_022DC240.inc
+++ b/asm/include/overlay_29_022DC240.inc
@@ -2,7 +2,7 @@
 .public _020AFC4C
 .public _020AFC70
 .public _s32_div_f
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public AllocTopScreenStatus
 .public ChangeGiratinaFormIfSkyDungeon
 .public ClearHiddenStairs
diff --git a/asm/include/overlay_29_022E0378.inc b/asm/include/overlay_29_022E0378.inc
index d2a7afd9..aeaba1c4 100644
--- a/asm/include/overlay_29_022E0378.inc
+++ b/asm/include/overlay_29_022E0378.inc
@@ -2,7 +2,7 @@
 .public _020AFC28
 .public _020AFC4C
 .public _020AFC70
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public AnimationDelayOrSomething
 .public CalcSpeedStageWrapper
 .public DisplayMessage2
diff --git a/asm/include/overlay_29_022F7388.inc b/asm/include/overlay_29_022F7388.inc
index 6fa1a725..15f9e3e9 100644
--- a/asm/include/overlay_29_022F7388.inc
+++ b/asm/include/overlay_29_022F7388.inc
@@ -50,7 +50,7 @@
 .public GetDirectionTowardsPosition
 .public GetExp
 .public GetExplorerMazeMonster
-.public GetFileLengthInPackWithPackNb
+.public DirectoryFileMngr_GetDirectoryFileSize
 .public GetFloorType
 .public GetForcedLossReason
 .public GetLeader
diff --git a/asm/include/overlay_29_0231CBEC.inc b/asm/include/overlay_29_0231CBEC.inc
index b3f71172..b9bbc38a 100644
--- a/asm/include/overlay_29_0231CBEC.inc
+++ b/asm/include/overlay_29_0231CBEC.inc
@@ -1,7 +1,7 @@
 #pragma once
 .public _020A1894
 .public AbilityIsActiveVeneer
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public ATK_STAT_IDX
 .public BoostIQ
 .public BoostOffensiveStat
diff --git a/asm/include/overlay_29_02337CCC.inc b/asm/include/overlay_29_02337CCC.inc
index fb0958c0..fd85c981 100644
--- a/asm/include/overlay_29_02337CCC.inc
+++ b/asm/include/overlay_29_02337CCC.inc
@@ -3,7 +3,7 @@
 .public _020AFC70
 .public _s32_div_f
 .public abs
-.public AllocAndLoadFileInPack
+.public DirectoryFileMngr_OpenDirectoryFile
 .public CORNER_CARDINAL_NEIGHBOR_IS_OPEN
 .public CountStickyItemsInBag
 .public DetermineAllTilesWalkableNeighbors
diff --git a/asm/main_0200C4CC.s b/asm/main_0200C4CC.s
index e333cc82..6c8596f4 100644
--- a/asm/main_0200C4CC.s
+++ b/asm/main_0200C4CC.s
@@ -21762,11 +21762,11 @@ _0201D4C0:
 	ldr sb, [r0, #0x500]
 	mov r0, r8
 	mov r1, r7
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r0, r8
 	mov r1, r7
 	mov r2, sb
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 	mov r0, sb
 	bl GetAtSize
 	mov r7, r0
@@ -21780,7 +21780,7 @@ _0201D4C0:
 _0201D53C:
 	mov r0, r8
 	mov r1, r7
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r1, r6
 	mov sb, r0
 	bl MemAlloc
@@ -21788,7 +21788,7 @@ _0201D53C:
 	mov r0, r8
 	mov r1, r7
 	mov r2, r6
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 	str sb, [r4, #0x28]
 _0201D56C:
 	str r6, [r4, #0x34]
@@ -21832,11 +21832,11 @@ _0201D5CC:
 	ldr sb, [r0, #0x500]
 	mov r0, r8
 	mov r1, r7
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r0, r8
 	mov r1, r7
 	mov r2, sb
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 	mov r0, sb
 	bl GetAtSize
 	mov r2, sb
@@ -21847,11 +21847,11 @@ _0201D5CC:
 _0201D62C:
 	mov r0, r8
 	mov r1, r7
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r0, r8
 	mov r1, r7
 	mov r2, r6
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 _0201D648:
 	mov r0, #2
 	strb r0, [r4, #0x21]
@@ -21885,11 +21885,11 @@ ReplaceWanFromBinFile: ; 0x0201D684
 	mov r0, r5
 	mov r1, r4
 	ldr r8, [r6, #0x34]
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r0, r5
 	mov r1, r4
 	mov r2, r7
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 	mov r0, r7
 	bl GetAtSize
 	mov r2, r7
@@ -21901,11 +21901,11 @@ _0201D6E8:
 	ldr r7, [r6, #0x34]
 	mov r0, r5
 	mov r1, r4
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	mov r0, r5
 	mov r1, r4
 	mov r2, r7
-	bl LoadFileInPackWithPackId
+	bl DirectoryFileMngr_LoadDirectoryFile
 _0201D708:
 	ldr r1, [r6, #0x34]
 	add r0, r6, #0x30
@@ -22558,7 +22558,7 @@ LoadWteFromFileDirectory: ; 0x0201DEC4
 	mov r0, r1
 	mov r1, r2
 	add r2, sp, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp]
 	add r0, sp, #8
 	bl HandleSir0Translation
@@ -22639,7 +22639,7 @@ LoadWtuFromBin: ; 0x0201DFB4
 	mov r0, r7
 	mov r1, r6
 	mov r3, r5
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r5, [sp]
 	ldr r1, _0201E01C ; =_02099720
 	str r5, [r4]
@@ -88843,7 +88843,7 @@ GetLvlUpEntry: ; 0x0205379C
 	add r2, sp, #4
 	mov r0, #5
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
diff --git a/asm/main_02054C24.s b/asm/main_02054C24.s
index 17599099..938547fb 100644
--- a/asm/main_02054C24.s
+++ b/asm/main_02054C24.s
@@ -4731,7 +4731,7 @@ sub_0205882C: ; 0x0205882C
 	add r2, sp, #0x14
 	mov r0, #4
 	str r3, [sp, #0x1c]
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #0x14]
 	add r0, sp, #0x1c
 	bl HandleSir0Translation
@@ -4861,7 +4861,7 @@ _02058928:
 	add r2, sp, #0xc
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #0xc]
 	add r0, sp, #8
 	bl HandleSir0Translation
@@ -19568,7 +19568,7 @@ _02064B94:
 	mov r3, r6
 	str r7, [r5, #0x48]
 	add r2, r5, #0x50
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldrsh r2, [r5, #0x4c]
 	add r1, sp, #0
 	mov r0, r5
@@ -20955,7 +20955,7 @@ MainLoop: ; 0x02065D1C
 	ldr r0, [r0]
 	bl InitWanTable
 	bl sub_0201F208
-	bl OpenAllPackFiles
+	bl DirectoryFileMngr_ExtractAllDirectoryFiles
 	bl sub_0204AB18
 	bl InitKaomadoStream
 	bl sub_02025AD8
diff --git a/asm/main_02075600.s b/asm/main_02075600.s
index 8099d7c8..355b87c8 100644
--- a/asm/main_02075600.s
+++ b/asm/main_02075600.s
@@ -52459,15 +52459,15 @@ _020AFF3C_EU:
 
 	; pack file related
 
-	.global PACK_FILES_OPENED ; 0x20af69c
-	PACK_FILES_OPENED:
-	; [Runtime] A pointer to the 6 opened Pack files (listed at PACK_FILE_PATHS_TABLE)
+	.global DIRECTORY_FILES_EXTRACTED ; 0x20af69c
+	DIRECTORY_FILES_EXTRACTED:
+	; [Runtime] A pointer to the 6 opened Pack files (listed at DIRECTORY_FILE_TABLE)
 	.word 0x0
 
 	; List of pointers to path strings to all known pack files.
 	; The game uses this table to load its resources when launching dungeon mode.
-	.global PACK_FILE_PATHS_TABLE ; 0x020af6a0
-	PACK_FILE_PATHS_TABLE:
+	.global DIRECTORY_FILE_TABLE ; 0x020af6a0
+	DIRECTORY_FILE_TABLE:
 	.word STRING_MONSTER_MONSTER_BIN
 	.word STRING_MONSTER_M_ATTACK_BIN
 	.word STRING_MONSTER_M_GROUND_BIN
diff --git a/asm/overlay_10.s b/asm/overlay_10.s
index ad36e170..25f6b818 100644
--- a/asm/overlay_10.s
+++ b/asm/overlay_10.s
@@ -2244,7 +2244,7 @@ _022BE830:
 	add r1, r1, #0x10c
 	mov r1, r1, lsl #0x10
 	mov r1, r1, lsr #0x10
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	cmp r4, r0
 	bge _022BE980
 	add r5, sp, #0x30
@@ -2306,7 +2306,7 @@ _022BE918:
 	mov r1, r1, asr #0x10
 	mov r1, r1, lsl #0x10
 	mov r1, r1, lsr #0x10
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	cmp r4, r0
 	bge _022BE980
 	add r5, sp, #4
@@ -6980,7 +6980,7 @@ ov10_022C2588: ; 0x022C2588
 	mov r1, r0, lsr #0x10
 	add r2, sp, #4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -7007,7 +7007,7 @@ ov10_022C25EC: ; 0x022C25EC
 	mov r1, r0, lsr #0x10
 	mov r2, r4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [r4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -7041,7 +7041,7 @@ ov10_022C2654: ; 0x022C2654
 	mov r1, r0, lsr #0x10
 	mov r2, r4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [r4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -7076,7 +7076,7 @@ InitTilesetBuffer: ; 0x022C26BC
 	mov r1, r0, lsr #0x10
 	add r2, sp, #4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -7109,7 +7109,7 @@ ov10_022C2720: ; 0x022C2720
 	add r2, sp, #4
 	mov r3, r4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -7126,7 +7126,7 @@ _022C2788:
 	add r2, sp, #4
 	mov r3, r4
 	mov r0, #4
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
diff --git a/asm/overlay_29_022DC240.s b/asm/overlay_29_022DC240.s
index 9fb3b3d8..7a7b61bb 100644
--- a/asm/overlay_29_022DC240.s
+++ b/asm/overlay_29_022DC240.s
@@ -2511,7 +2511,7 @@ ov29_022DE300: ; 0x022DE300
 	mov r3, #0
 	ldr r2, [r2]
 	add r2, r2, #0x40
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r0, _022DE410 ; =ov29_02353530
 	ldr r1, [r0]
 	add r0, r1, #0x48
diff --git a/asm/overlay_29_022E0378.s b/asm/overlay_29_022E0378.s
index 811d479a..174d5831 100644
--- a/asm/overlay_29_022E0378.s
+++ b/asm/overlay_29_022E0378.s
@@ -996,7 +996,7 @@ _022E0F80:
 	add r2, sp, #8
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #8]
 	add r0, sp, #0x14
 	bl HandleSir0Translation
@@ -1020,7 +1020,7 @@ _022E0F80:
 	mov r0, #4
 	add r2, sp, #8
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #8]
 	add r0, sp, #0x10
 	bl HandleSir0Translation
@@ -1060,7 +1060,7 @@ _022E1038:
 	add r2, sp, #8
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #8]
 	add r0, sp, #0x18
 	bl HandleSir0Translation
@@ -1084,7 +1084,7 @@ _022E1038:
 	mov r0, #4
 	add r2, sp, #8
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #8]
 	add r0, sp, #0x1c
 	bl HandleSir0Translation
@@ -1103,7 +1103,7 @@ _022E1038:
 	mov r0, #4
 	mov r1, #0x3e4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, _022E11EC ; =ov29_02353540
 	ldr r0, _022E11F0 ; =ov29_02353540
 	ldr r1, [r1, #4]
@@ -1160,7 +1160,7 @@ ov29_022E11F8: ; 0x022E11F8
 	add r2, sp, #4
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
@@ -1242,7 +1242,7 @@ ov29_022E1304: ; 0x022E1304
 	add r2, sp, #8
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #8]
 	add r0, sp, #0x10
 	bl HandleSir0Translation
diff --git a/asm/overlay_29_022F7388.s b/asm/overlay_29_022F7388.s
index 31fb6d5a..c7c2f546 100644
--- a/asm/overlay_29_022F7388.s
+++ b/asm/overlay_29_022F7388.s
@@ -167,7 +167,7 @@ _022F756C:
 _022F7598:
 	mov r1, r4
 	mov r0, #0
-	bl GetFileLengthInPackWithPackNb
+	bl DirectoryFileMngr_GetDirectoryFileSize
 	ldr r1, _022F75C4 ; =DUNGEON_PTR
 	ldr r1, [r1]
 	add r1, r1, #0x2c000
diff --git a/asm/overlay_29_0231CBEC.s b/asm/overlay_29_0231CBEC.s
index fc807e2f..6cf59e14 100644
--- a/asm/overlay_29_0231CBEC.s
+++ b/asm/overlay_29_0231CBEC.s
@@ -940,7 +940,7 @@ ApplyGonePebbleEffect: ; 0x0231D838
 	mov r0, #4
 	add r2, sp, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, [sp, #4]
 	add r0, sp, #0
 	bl HandleSir0Translation
diff --git a/asm/overlay_29_02337CCC.s b/asm/overlay_29_02337CCC.s
index f7841991..ea2df29c 100644
--- a/asm/overlay_29_02337CCC.s
+++ b/asm/overlay_29_02337CCC.s
@@ -1533,7 +1533,7 @@ ov29_02338F68: ; 0x02338F68
 	ldr r2, _02338FC0 ; =ov29_02353784
 	mov r0, #4
 	mov r3, #0
-	bl AllocAndLoadFileInPack
+	bl DirectoryFileMngr_OpenDirectoryFile
 	ldr r1, _02338FC4 ; =ov29_0235376C
 	add r0, sp, #0
 	ldr r1, [r1, #0x18]
diff --git a/include/directory_file.h b/include/directory_file.h
new file mode 100644
index 00000000..c8c77452
--- /dev/null
+++ b/include/directory_file.h
@@ -0,0 +1,42 @@
+#ifndef PMDSKY_DIRECTORY_FILE_H
+#define PMDSKY_DIRECTORY_FILE_H
+
+#include <file.h>
+
+struct directory_entry {
+    u32 offset; // The offset of the file relative to the start of the Pack file
+    u32 length; // The size of the file
+};
+
+/*  Information for reading a .bin Pack file
+
+    A pack file is an archive that contains multiple other files. They aren't named.
+
+    File format documentation at
+   https://projectpokemon.org/docs/mystery-dungeon-nds/pmd2-pack-file-format-r42 */
+struct directory {
+    struct directory_entry* table_of_content;
+    u32 zero; // Loaded from file, but is always zero here. Seemingly unused.
+    u32 nb_entry_table_of_content; // loaded from file
+    struct file_stream opened_file;
+};
+
+// Open a Pack file, to be read later. Initialise the output structure.
+// pack_file: [output] pack file struct
+// file_path: file name
+void DirectoryFile_ExtractDirectoryFile(struct directory *pack_file, char *file_path);
+
+// Get the length of a file entry from a Pack archive
+// pack_file: pack file struct
+// file_index: file index
+// return: size of the file in bytes from the Pack Table of Content
+u32 DirectoryFile_GetDirectoryFileSize(struct directory* pack_file, u32 file_index);
+
+// Load the indexed file from the Pack archive, itself loaded from the ROM.
+// pack_file: pack file struct
+// output_buffer: [output] target buffer
+// file_index: file index
+// return: number of read bytes (identical to the length of the pack from the Table of Content)
+u32 DirectoryFile_LoadDirectoryFile(struct directory *pack_file, void *output_buffer,u32 file_index);
+
+#endif //PMDSKY_DIRECTORY_FILE_H
diff --git a/include/directory_file_mngr.h b/include/directory_file_mngr.h
new file mode 100644
index 00000000..1e61245e
--- /dev/null
+++ b/include/directory_file_mngr.h
@@ -0,0 +1,44 @@
+#ifndef PMDSKY_DIRECTORY_FILE_MNGR_H
+#define PMDSKY_DIRECTORY_FILE_MNGR_H
+
+// Correspond to a .bin pack archive
+enum directory_id {
+    PACK_ARCHIVE_MONSTER = 0,
+    PACK_ARCHIVE_M_ATTACK = 1,
+    PACK_ARCHIVE_M_GROUND = 2,
+    PACK_ARCHIVE_EFFECT = 3,
+    PACK_ARCHIVE_DUNGEON = 4,
+    PACK_ARCHIVE_M_LEVEL = 5
+};
+
+// Contain return result of the DirectoryFileMngr_OpenDirectoryFile function
+struct directory_open_result {
+    void* data;
+    u32 length;
+};
+
+// Open the 6 files at DIRECTORY_FILE_TABLE into DIRECTORY_FILES_EXTRACTED. Called during game initialization.
+void DirectoryFileMngr_ExtractAllDirectoryFiles(void);
+
+// Call DirectoryFile_GetDirectoryFileSize after looking up the global Pack archive by its number
+// pack_id: pack file number
+// file_index: file number
+// return: size of the file in bytes from the Pack Table of Content
+u32 DirectoryFileMngr_GetDirectoryFileSize(enum directory_id pack_id, u32 file_index);
+
+// Call DirectoryFile_LoadDirectoryFile after looking up the global Pack archive by its identifier
+// pack_id: pack file identifier
+// file_index: file index
+// output_buffer: [output] target buffer
+// return: number of read bytes (identical to the length of the pack from the Table of Content)
+u32 DirectoryFileMngr_LoadDirectoryFile(enum directory_id pack_id, u32 file_index, void* output_buffer);
+
+// Allocate a file and load a file from the pack archive inside.
+// The data pointed by the pointer in the output need to be freed once is not needed anymore.
+// pack_id: pack file identifier
+// file_index: file index
+// output: [output] result struct (will contain length and pointer)
+// malloc_flags: allocation flags
+void DirectoryFileMngr_OpenDirectoryFile(enum directory_id pack_id, u32 file_index, struct directory_open_result *output, u32 malloc_flags);
+
+#endif //PMDSKY_DIRECTORY_FILE_MNGR_H
diff --git a/include/files/pack.h b/include/files/pack.h
deleted file mode 100644
index bceea285..00000000
--- a/include/files/pack.h
+++ /dev/null
@@ -1,40 +0,0 @@
-#ifndef PMDSKY_FILES_PACK_H
-#define PMDSKY_FILES_PACK_H
-
-#include <file.h>
-
-struct pack_file_table_of_content {
-    u32 offset; // The offset of the file relative to the start of the Pack file
-    u32 length; // The size of the file
-};
-
-/*  Information for reading a .bin Pack file
-
-    A pack file is an archive that contains multiple other files. They aren't named.
-
-    File format documentation at
-   https://projectpokemon.org/docs/mystery-dungeon-nds/pmd2-pack-file-format-r42 */
-struct pack_file_opened {
-    struct pack_file_table_of_content* table_of_content;
-    u32 zero; // Loaded from file, but is always zero here. Seemingly unused.
-    u32 nb_entry_table_of_content; // loaded from file
-    struct file_stream opened_file;
-};
-
-// Correspond to a .bin pack archive
-enum pack_file_id {
-    PACK_ARCHIVE_MONSTER = 0,
-    PACK_ARCHIVE_M_ATTACK = 1,
-    PACK_ARCHIVE_M_GROUND = 2,
-    PACK_ARCHIVE_EFFECT = 3,
-    PACK_ARCHIVE_DUNGEON = 4,
-    PACK_ARCHIVE_M_LEVEL = 5
-};
-
-// Contain return result of the AllocAndLoadFileInPack function
-struct pack_alloc_and_load_result {
-    void* data;
-    u32 length;
-};
-
-#endif
\ No newline at end of file
diff --git a/include/main_pack.h b/include/main_pack.h
deleted file mode 100644
index c7431e10..00000000
--- a/include/main_pack.h
+++ /dev/null
@@ -1,48 +0,0 @@
-#ifndef PMDSKY_MAIN_PACK_H
-#define PMDSKY_MAIN_PACK_H
-
-#include <files/pack.h>
-
-// Open the 6 files at PACK_FILE_PATHS_TABLE into PACK_FILES_OPENED. Called during game initialization.
-void OpenAllPackFiles(void);
-
-// Call GetFileLengthInPack after looking up the global Pack archive by its number
-// pack_id: pack file number
-// file_index: file number
-// return: size of the file in bytes from the Pack Table of Content
-u32 GetFileLengthInPackWithPackNb(enum pack_file_id pack_id, u32 file_index);
-
-// Call LoadFileInPack after looking up the global Pack archive by its identifier
-// pack_id: pack file identifier
-// file_index: file index
-// output_buffer: [output] target buffer
-// return: number of read bytes (identical to the length of the pack from the Table of Content)
-u32 LoadFileInPackWithPackId(enum pack_file_id pack_id, u32 file_index, void* output_buffer);
-
-// Allocate a file and load a file from the pack archive inside.
-// The data pointed by the pointer in the output need to be freed once is not needed anymore.
-// pack_id: pack file identifier
-// file_index: file index
-// output: [output] result struct (will contain length and pointer)
-// malloc_flags: allocation flags
-void AllocAndLoadFileInPack(enum pack_file_id pack_id, u32 file_index, struct pack_alloc_and_load_result *output, u32 malloc_flags);
-
-// Open a Pack file, to be read later. Initialise the output structure.
-// pack_file: [output] pack file struct
-// file_path: file name
-void OpenPackFile(struct pack_file_opened *pack_file, char *file_path);
-
-// Get the length of a file entry from a Pack archive
-// pack_file: pack file struct
-// file_index: file index
-// return: size of the file in bytes from the Pack Table of Content
-u32 GetFileLengthInPack(struct pack_file_opened* pack_file, u32 file_index);
-
-// Load the indexed file from the Pack archive, itself loaded from the ROM.
-// pack_file: pack file struct
-// output_buffer: [output] target buffer
-// file_index: file index
-// return: number of read bytes (identical to the length of the pack from the Table of Content)
-u32 LoadFileInPack(struct pack_file_opened *pack_file, void *output_buffer,u32 file_index);
-
-#endif //PMDSKY_MAIN_PACK_H
diff --git a/main.lsf b/main.lsf
index 3e29c122..ba7e2075 100644
--- a/main.lsf
+++ b/main.lsf
@@ -11,7 +11,8 @@ Static main
 	StackSize 0 2048
 	Object asm/main_02000C6C.o
 	Object src/debug.o
-	Object src/main_pack.o
+	Object src/directory_file_mngr.o
+	Object src/directory_file.o
 	Object asm/main_0200C4CC.o
 	Object src/main_02054BE0.o
 	Object asm/main_02054C24.o
diff --git a/src/directory_file.c b/src/directory_file.c
new file mode 100644
index 00000000..89114058
--- /dev/null
+++ b/src/directory_file.c
@@ -0,0 +1,45 @@
+#include "directory_file.h"
+
+extern void DataTransferInit(void);
+extern void DataTransferStop(void);
+extern void FileSeek(struct file_stream* file, int offset, int whence);
+extern u32 FileRead(struct file_stream* file, void* buf, u32 size);
+extern void FileInitVeneer(struct file_stream* file);
+extern void FileOpen(struct file_stream* file, const char* filepath);
+
+#include "debug.h"
+
+extern void* MemAlloc(u32 len, u32 flags);
+
+extern char STRING_FILE_DIRECTORY_INIT;
+
+
+void DirectoryFile_ExtractDirectoryFile(struct directory *pack_file, char *file_path) {
+  DataTransferInit();
+  FileInitVeneer(&pack_file->opened_file);
+  FileOpen(&pack_file->opened_file,file_path);
+  FileRead(&pack_file->opened_file,&pack_file->zero,8);
+  FileSeek(&pack_file->opened_file,8,0);
+  u32 toc_total_size = pack_file->nb_entry_table_of_content * sizeof(struct directory_entry);
+  struct directory_entry *toc_alloc = (struct directory_entry *) MemAlloc(toc_total_size, 0);
+  pack_file->table_of_content = toc_alloc;
+  FileRead(&pack_file->opened_file,pack_file->table_of_content,toc_total_size);
+  Debug_Print0(&STRING_FILE_DIRECTORY_INIT,pack_file->zero,
+              pack_file->nb_entry_table_of_content,toc_total_size,file_path);
+  DataTransferStop();
+  return;
+}
+
+u32 DirectoryFile_GetDirectoryFileSize(struct directory* pack_file, u32 file_index) {
+  struct directory_entry* element = &pack_file->table_of_content[file_index];
+  return element->length;
+}
+
+u32 DirectoryFile_LoadDirectoryFile(struct directory *pack_file,void *output_buffer,u32 file_index) {
+  DataTransferInit();
+  struct directory_entry *toc_entry = &pack_file->table_of_content[file_index];
+  FileSeek(&pack_file->opened_file,toc_entry->offset,0);
+  FileRead(&pack_file->opened_file,output_buffer,toc_entry->length);
+  DataTransferStop();
+  return toc_entry->length;
+}
diff --git a/src/directory_file_mngr.c b/src/directory_file_mngr.c
new file mode 100644
index 00000000..0265e9f9
--- /dev/null
+++ b/src/directory_file_mngr.c
@@ -0,0 +1,35 @@
+#include "directory_file_mngr.h"
+#include "directory_file.h"
+
+extern void* MemAlloc(u32 len, u32 flags);
+extern void MemZero(void* ptr, u32 len);
+
+extern struct directory *DIRECTORY_FILES_EXTRACTED;
+extern char* DIRECTORY_FILE_TABLE[6];
+
+void DirectoryFileMngr_ExtractAllDirectoryFiles(void) {
+  u32 total_size = sizeof(struct directory[6]);
+  DIRECTORY_FILES_EXTRACTED = MemAlloc(total_size, 0);
+  MemZero(DIRECTORY_FILES_EXTRACTED, total_size);
+  for (s16 i = 0; i < 6; i++) {
+      DirectoryFile_ExtractDirectoryFile(&DIRECTORY_FILES_EXTRACTED[i], DIRECTORY_FILE_TABLE[i]);
+  };
+}
+
+u32 DirectoryFileMngr_GetDirectoryFileSize(enum directory_id pack_id, u32 file_index) {
+  struct directory* pack_file = &DIRECTORY_FILES_EXTRACTED[pack_id];
+  return DirectoryFile_GetDirectoryFileSize(pack_file, file_index);
+}
+
+u32 DirectoryFileMngr_LoadDirectoryFile(enum directory_id pack_id, u32 file_index, void* output_buffer) {
+  return DirectoryFile_LoadDirectoryFile(&DIRECTORY_FILES_EXTRACTED[pack_id], output_buffer, file_index);
+}
+
+void DirectoryFileMngr_OpenDirectoryFile(enum directory_id pack_id, u32 file_index, struct directory_open_result *output, u32 malloc_flags) {
+  u32 entry_length = DirectoryFile_GetDirectoryFileSize(&DIRECTORY_FILES_EXTRACTED[pack_id], file_index);
+  output->length = entry_length;
+  void * data_dest = MemAlloc(output->length, malloc_flags);
+  output->data = data_dest;
+  DirectoryFile_LoadDirectoryFile(&DIRECTORY_FILES_EXTRACTED[pack_id], output->data, file_index);
+  return;
+}
diff --git a/src/main_pack.c b/src/main_pack.c
deleted file mode 100644
index fca9b3cd..00000000
--- a/src/main_pack.c
+++ /dev/null
@@ -1,72 +0,0 @@
-#include "main_pack.h"
-
-extern void DataTransferInit(void);
-extern void DataTransferStop(void);
-extern void FileSeek(struct file_stream* file, int offset, int whence);
-extern u32 FileRead(struct file_stream* file, void* buf, u32 size);
-extern void FileInitVeneer(struct file_stream* file);
-extern char STRING_FILE_DIRECTORY_INIT;
-extern void Debug_Print0(const char* fmt, ...);
-extern void FileOpen(struct file_stream* file, const char* filepath);
-extern void* MemAlloc(u32 len, u32 flags);
-extern void MemZero(void* ptr, u32 len);
-
-extern struct pack_file_opened *PACK_FILES_OPENED;
-extern char* PACK_FILE_PATHS_TABLE[6];
-
-void OpenAllPackFiles(void) {
-  u32 total_size = sizeof(struct pack_file_opened[6]);
-  PACK_FILES_OPENED = MemAlloc(total_size, 0);
-  MemZero(PACK_FILES_OPENED, total_size);
-  for (s16 i = 0; i < 6; i++) {
-      OpenPackFile(&PACK_FILES_OPENED[i], PACK_FILE_PATHS_TABLE[i]);
-  };
-}
-
-u32 GetFileLengthInPackWithPackNb(enum pack_file_id pack_id, u32 file_index) {
-  struct pack_file_opened* pack_file = &PACK_FILES_OPENED[pack_id];
-  return GetFileLengthInPack(pack_file, file_index);
-}
-
-u32 LoadFileInPackWithPackId(enum pack_file_id pack_id, u32 file_index, void* output_buffer) {
-  return LoadFileInPack(&PACK_FILES_OPENED[pack_id], output_buffer, file_index);
-}
-
-void AllocAndLoadFileInPack(enum pack_file_id pack_id, u32 file_index, struct pack_alloc_and_load_result *output, u32 malloc_flags) {
-  u32 entry_length = GetFileLengthInPack(&PACK_FILES_OPENED[pack_id], file_index);
-  output->length = entry_length;
-  void * data_dest = MemAlloc(output->length, malloc_flags);
-  output->data = data_dest;
-  LoadFileInPack(&PACK_FILES_OPENED[pack_id], output->data, file_index);
-  return;
-}
-
-void OpenPackFile(struct pack_file_opened *pack_file, char *file_path) {
-  DataTransferInit();
-  FileInitVeneer(&pack_file->opened_file);
-  FileOpen(&pack_file->opened_file,file_path);
-  FileRead(&pack_file->opened_file,&pack_file->zero,8);
-  FileSeek(&pack_file->opened_file,8,0);
-  u32 toc_total_size = pack_file->nb_entry_table_of_content * sizeof(struct pack_file_table_of_content);
-  struct pack_file_table_of_content *toc_alloc = (struct pack_file_table_of_content *) MemAlloc(toc_total_size, 0);
-  pack_file->table_of_content = toc_alloc;
-  FileRead(&pack_file->opened_file,pack_file->table_of_content,toc_total_size);
-  Debug_Print0(&STRING_FILE_DIRECTORY_INIT,pack_file->zero,
-              pack_file->nb_entry_table_of_content,toc_total_size,file_path);
-  DataTransferStop();
-  return;
-}
-
-u32 GetFileLengthInPack(struct pack_file_opened* pack_file, u32 file_index) {
-  struct pack_file_table_of_content* element = &pack_file->table_of_content[file_index];
-  return element->length;
-}
-
-u32 LoadFileInPack(struct pack_file_opened *pack_file,void *output_buffer,u32 file_index) {
-  DataTransferInit();
-  struct pack_file_table_of_content *toc_entry = &pack_file->table_of_content[file_index];
-  FileSeek(&pack_file->opened_file,toc_entry->offset,0);
-  FileRead(&pack_file->opened_file,output_buffer,toc_entry->length);
-  DataTransferStop();
-  return toc_entry->length;
-}