AAR (File Format)

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AAR (Aqualead ARchive) is an archive format developed by Aqualead and found in some Wii and 3DS games (and suspected to be used in GameCube titles as well), such as One Piece: Unlimited Adventure, One Piece: Unlimited Cruise Episode 1 - The Treasure Beneath The Waves, One Piece: Unlimited Cruise Episode 2: Awakening of a Hero, One Piece: Unlimited Cruise SP and One Piece: Unlimited Cruise SP 2.

File Format

The file byte order can be either big endian (Wii) or little endian (3DS). AAR's internal files may link between themselves by using unique asset link identifiers. These identifiers may only be reused between files of different formats.

Header

The file starts with the following header:

Offset	Type	Description
0x00	Char[4]	File magic. Always ALAR in ASCII.
0x04	Byte	Format type.
0x05	Byte	Unknown.
0x06	UInt16	Number of file entries (N).
If format = 2
0x08	Byte	Padding.
0x09	UInt24	First asset link identifier.
0x0C	Byte	Padding.
0x0D	UInt24	Last asset link identifier.
0x10	File Entry[N]	File entries.
Else if format = 3
0x08	Byte[4]	Unknown. Always 0?
0x0C	Byte	Padding.
0x0D	UInt24	First asset link identifier.
0x10	UInt16	Data section offset.
0x12	UInt16[N]	File entries offsets.

File Entry

Each file entry has the following structure:

Offset	Type	Description
0x00	Byte	File type: 0x00 = Other/No extension 0x40 = Texture (ATX, TPL) 0x41 = Motion (AMT) 0x42 = Image (AIG, TGA) 0x43 = Assemble/resource (AOD) 0x44 = Mesh (AMS) 0x45 = Palette 0x46 = Tilemap 0x47 = Archive (AAR) 0x48 = Sound 0x49 = Table definition 0x4A = Table (ATB) 0x4B = Shader (ASD) 0x4C = Script (NUT) 0x4D = Font (AFT) 0x4E = ID mask 0x4F = Extension mask
0x01	UInt24	Asset link identifier.
0x04	UInt32	File data offset.
0x08	UInt32	File size in bytes (S).
0x0C	Byte[4]	Unknown flags. Always 0x80000001.
If format = 3
0x10	UInt16	Unknown.
0x12	StringNT	File name.

File Data

Offset	Type	Description
If format = 2
-0x24	UInt16	Unknown.
-0x22	StringNT	File name.
-0x02	UInt16	Unknown.
0x00	Byte[S]	File data.

Tools

The following tools can handle AAR files:

• (none)