EA STRM (File Format)

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STRM is an archive file format used in some Wii games developed by EA, such as Boom Blox and Monopoly Streets. It is usually compressed with RefPack and found with the .rpk extension.

File Format

The file byte order is always big endian in Wii games. All offsets are absolute.

File Header

The file starts with the following header:

Offset	Type	Description
0x00	Char[4]	File magic. Always STRM in ASCII.
0x04	UInt32	File size in bytes.

AGRP

STRM files may contain multiple AGRP sections. These sections contain one GHDR section and multiple ASET sections.

Offset	Type	Description
0x00	Char[4]	Section magic. Always AGRP in ASCII.
0x04	UInt32	Section size in bytes.

GHDR

Unknown.

Offset	Type	Description
0x00	Char[4]	Section magic. Always GHDR in ASCII.
0x04	UInt32	Section size in bytes.
0x08	UInt32	Unknown.
0x0C	UInt32	Offset to name tag in the STRS section.
0x10	UInt32	Unknown. Always the same value as 0x8?

ASET

ASET sections link asset paths with their binary data.

Offset	Type	Description
0x00	Char[4]	Section magic. Always ASET in ASCII.
0x04	UInt32	Section size in bytes.
0x08	Byte[4]	Unknown. Flags?
0x0C	UInt32	Unknown.
0x10	UInt32	Unknown.
0x14	UInt32	Unknown.
0x18	UInt32	File data offset in the DATA section.
0x1C	UInt32	File data size in bytes.
0x20	UInt32	Asset path offset in the STRS section.
0x24	UInt32	Unknown. Always 0?

STRS

This section contains null-terminated strings, aligned by 0x4.

Offset	Type	Description
0x00	Char[4]	Section magic. Always STRS in ASCII.
0x04	UInt32	Section size in bytes.

DATA

This section contains file data, aligned by 0x20.

Offset	Type	Description
0x00	Char[4]	Section magic. Always DATA in ASCII.
0x04	UInt32	Section size in bytes.

Tools

The following tools can handle EA STRM files:

• (none)