Files like WMMT6 Resolution Patcher.7z are often used alongside the main archive to allow the game to run at modern 1080p or 4K resolutions.
There is also the small paranoia of modern life: compressed archives as vessels of trust and risk. Every downloadable package is a promise and an unknown. You imagine someone hesitating at the download button, wondering whether to trust the name on the server, the voice in the thread that suggested it. Wmmt6.7z is a test of curiosity: a private mythology waiting to be decrypted by whoever decides to double-click.