I am actually currently in the process of trying to reverse engineer the format and make essentially an editor for it. Got the files to decompress and can read data though having some trouble with changing strings as there seems to be some pointers around the file that break when the file size gets changes.
http://aom.heavengames.com/downloads/showfile.php?fileid=11116
The above can be used to decompress the file and compress it if you want to have a look. (It is not the editor program I am creating but lets you have a look yourself with a hex editor)[This message has been edited by nottud (edited 12-21-2019 @ 04:24 AM).]