There were several changes that I made, but the main one was an update to Tanya. ini files, so they're easy to edit (rules.ini, art.ini, etc.).
The config files are regular ol' plain-text. For those unfamiliar with it, the game is an RTS, and its configuration files are hidden in a proprietary archive format, but if a file with the same name exists in the game's directory, the game uses that file instead of the archived one.
Some time ago I made a mod for Red Alert that was quite ridiculous.
