My experiences with WinMX seem to cover from about 2002 onward, and in that time, i dont think ever a FAKE file, but lots of (deliberately?) mis-named files.
During the great flooding era, i do remember trying to search for and download one particular file that always produced thousands of results in search, but none could actually be downloaded
It was still better than iMesh (bbbbbbbbrrrrrrrrrrrrrrrrrrrrr, horrible...)
Then came the Great Disconnect