IGZ (File Format)

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IGZ is a file format used in games developed by Vicarious Visions, such as Marvel Ultimate Alliance 2, Crash Bandicoot N. Sane Trilogy and Crash Team Racing Nitro-Fueled.

File Format

The file byte order is always little endian.

Header

Offset	Type	Description
0x00	Byte	Unknown. Always 1. Probably part of the magic.
0x01	Char[3]	File magic Always ZGI in ASCII.
0x04	UInt32	File version.
0x08	UInt32	Unknown. Probably a hash.
0x0C	UInt32	Unknown.
0x10	UInt32	Number of data blocks.
0x14	UInt32	Unknown.
0x18	UInt32	Possible first block offset.
0x1C	UInt32	Unknown.
0x20	UInt32	Same as 0x18.
0x24	UInt32	Unknown.
0x28	UInt32	Offset to mesh structure?
0x2C	UInt32	Unknown.
0x30	UInt32	Unknown.
0x34	UInt32	Unknown.
0x38	UInt32	Buffer data offset.
0x3C	UInt32	Buffer data offset.
0x40	UInt32	Unknown.

After the header there are many null bytes, and at 0x224, there are two strings following each other. How this data is handled is unknown.

Block Header

Each block starts with the following header:

Offset	Type	Description
0x00	Char[4]	Section magic.
0x04	UInt32	Number of entries stored in the section.
0x08	UInt32	Size of this section in bytes.
0x0C	UInt32	Size of this section header in bytes.

TDEP

The TDEP section stores unknown pair strings.

TSTR

The TSTR section stores unknown strings.

TMET

The TMET section stores unknown strings.

MTSZ

The MTSZ section stores unknown data. Each entry consists of a UInt32.

EXID

The EXID section stores unknown data. Each entry has the following structure:

Offset	Type	Description
0x00	UInt32	Unknown.
0x04	UInt32	Unknown.

EXNM

The EXNM section stores unknown data. Each entry has the following structure:

Offset	Type	Description
0x00	UInt32	Unknown.
0x04	UInt32	Unknown.

RVTB

The RVTB section stores unknown data. Each entry consists of a byte.

RSTT

The RSTT section stores unknown data. Each entry consists of a byte.

ROFS

The ROFS section stores unknown data. Each entry consists of a byte.

RPID

The RPID section stores unknown data. Each entry consists of a byte.

RHND

The RHND section stores unknown data. Each entry has the following structure:

Offset	Type	Description
0x00	UInt32	Unknown.
0x04	UInt32	Unknown.

ROOT

The ROOT section stores unknown data. Each entry consists of a UInt32.

ONAM

The ONAM section stores unknown data. Each entry consists of a UInt32.

Tools

The following tools can handle IGZ files:

• (none)