Injustice 2 File Format

Detailed binary format specification for IJ2 .xxx files. Struct layouts verified via reverse engineering.

Header (FPackageFileSummary) — 100 bytes

Offset	Size	Field	Value
0x00	4	Tag	0x9E2A83C1
0x04	2+2	FileVersion + LicenseeVersion	732 + 157
0x08	4	TotalHeaderSize	varies
0x0C	4	MidwayTeamFourCC	"DCF2"
0x10	4	MidwayTeamVersion	80
0x14	4	ShaderVersion	570
0x18	4	BranchVersion	"DDEV"
0x1C	4	PackageFlags	0x02080000
0x20	12	NameTable (count + offset)	varies
0x2C	12	ExportTable (count + offset)	varies
0x38	12	ImportTable (count + offset)	varies
0x44	4	GameThreadExportCount	varies
0x48	16	GUID	varies
0x58	4	EngineVersion	2606
0x5C	4	CookedContentVersion	420
0x60	4	CompressionFlags	4 (Oodle)

FCompressedChunk — 24 bytes

Offset	Size	Field
0x00	8	UncompressedOffset (u64)
0x08	4	UncompressedSize (u32)
0x0C	8	CompressedOffset (u64)
0x14	4	CompressedSize (u32)

FObjectExport — 72+ bytes

Serialization order:

1. ClassIndex (i32) — resolve_object
2. SuperIndex (i32) — resolve_object
3. OuterIndex (i32) — resolve_object
4. ObjectName (FName = u32 index + u32 number)
5. ArchetypeIndex (i32) — resolve_object
6. ReferencedObjects (i32)
7. ObjectFlags (u64)
8. ObjectGuid (16 bytes, serialized as 4 x u32)
9. SerialSize (u32)
10. SerialOffset (u64)
11. ComponentMap (TMap<FName, int> — variable, typically count=0 → 4 bytes)
12. ExportFlags (u32)

FObjectImport — 28 bytes

Serialization order:

1. ClassPackage (FName = u32 + u32)
2. ClassName (FName = u32 + u32)
3. OuterIndex (i32) — resolve_object
4. ObjectName (FName = u32 + u32)

TFC (Texture File Cache)

IJ2 stores large texture mips in external .tfc files. See Texture2D Handler for the mip data structure.

Key characteristics:

• No centralized tables — references are per-texture
• TextureFileCacheName property specifies the .tfc file
• TFC data uses the same Oodle block compression format
• Large mips (1024+) in TFC, small mips inline in UPK