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This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_REL.

Endian Order:	Big Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Wario World [GameCube]

*.rel

This is the format specification information:

// ARCHIVE HEADER
  4 - Number of Files? (including Last File, which isn't in the directory)
  4 - null
  4 - null
  4 - Unknown (22)
  4 - Unknown (72)
  4 - Unknown (200)
  4 - Unknown (40)
  4 - Unknown (2)
  4 - null
  4 - Last File Offset (not in Directory)
  4 - Archive Length [+16]
  4 - Unknown (16)
  4 - Unknown
  4 - Unknown
  4 - Unknown
  4 - Unknown
  4 - Unknown (8)
  4 - Unknown (1)
  24 - null

// DIRECTORY
  // for each file [-1]
    4 - File Offset
    4 - File Length

X - null Padding to First File Offset

// FILE DATA
  // for each file [-1]
    X - File Data

Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.