PAC (File Format)

PAC files are archive containers found in Mario Kart Arcade GP DX and Luigi's Mansion Arcade. They contain layout and image data.

File Format

The file byte order is always little endian.

File Header

The file starts with a header that is 0x14 bytes long.

Offset	Type	Description
0x00	Char[4]	File magic. Always pack in ASCII.
0x04	Int32	Number of files.
0x08	Int32	Offset to String Pool, relative to the end of the File Entry List.
0x0C	Int32	Alignment used before file data. Always 0x20.
0x10	Int32	File type: 1 = layout 2 = image
0x14	End of header, start of File Entry List

File Entry List

After the header, there's an entry list with entries for each file. Each entry is 0x10 bytes long.

Offset	Type	Description
0x00	UInt32	Unknown. Seems to be some kind of hash of the real file name. Strings are assigned to each file in the String Pool, but they do not contain an extension.
0x04	Int32	Offset to file's string, relative to the start of the String Pool.
0x08	Int32	Offset to file data, relative to the end of the entry list.
0x0C	Int32	File length.

Followed by the last entry, the data is aligned from the header alignment.

String Pool

At the end of the file, after the file data, there's a string pool, which contains null-terminated strings linked to each file.

Tools

The following tools can handle PAC files:

• (none)