The GME file format

This is the result of reverse engineering (i.e. staring at hex codes for a long time), and might not always be accurate. Also, it is not complete; see the TODO list in README.md.

The file format is also described in GME-Format.md. Unfortunately the information there tends to diverge from the information maintained here.

The file format consists of these parts

• a header, with offsets into
• the data area, which includes the play scripts, the games, the audio files and other stuff, and finally
• a checksum.

All offsets are always relative to the start of the file. If we say something is an 8-bit number followed by a zero byte, it might of course also be a 16-bit number, and we just did not see high values yet.

All values are stored in little-endian format; offsets in this document are hexadecimal numbers, printed in the usual (big-endian) format. So if you see d5b2 0100 in the hexdump, it is an offset to position 0x1B2D5.

• Header
• Script table
• Play script
• Script line
• Playlist
• Playlistlist
• Game table
  • Games
    • Gametypes
    • Game-Examples
  • Subgames
• Register init values
• Media file table
• Additional media file table
• Additional script table
• Game binaries table
• Additional game binaries table
• Checksum