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

Endian Order:Little Endian
Compression:None
Encryption:None


This format is used by the following Games:
Open Season *.umd


This is the format specification information:
 
// FILE DATA
  // for each file
    X - File Data

// DIRECTORY
  // for each file
    3 - Unknown
    1 - Filename Length (including null terminator)
    X - Filename
    1 - null Filename Terminator
    4 - File Offset?
    4 - File Length?
    4 - null
    8 - Hash?

// ARCHIVE FOOTER
  1 - null Start Of Footer tag
  4 - Unknown
  4 - Directory Offset
  4 - Unknown (19)
  4 - Unknown (2)
  4 - null


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.