With MEXSCAN you can scan a datafile with an unknown format. It will search for format ID tags that MultiEx already knows, it will scan for specific files, like WAVE (*.WAV) tags among others and it will scan for a header or tail. All the info it can get from the datafile it will log in a textfile named after your file. If you let it scan pak0.pak from quake2 for instance then the log file that is created will be named pak0.txt.