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

Endian Order:	Little Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Sonic and SEGA All Stars Racing

*.xpac

This is the format specification information:

// ARCHIVE HEADER
  8 - null
  4 - First File Offset
  4 - Number of Files
  4 - null
  
// DETAILS DIRECTORY
  // for each file (20 bytes per entry)
    4 - null
    4 - Hash?
    4 - File Offset
    4 - File Length (not including padding)
    4 - File Length (not including padding)

0-2047 - Padding to a multiple of 2048 bytes

// FILE DATA
  // for each file
    X - File Data
    0-2047 - Padding to a multiple of 2048 bytes

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.