I have found one I really detest...

"TESmodmanager" I found it on the Nexus (Skyrim) but it's supposed to be for MW, OBlivion & Skyrim. I used it to install a hud mod then tried to play & found out I was "missing" mods that were active.

Then found out when I went into "Data Files" that it was adding ".ghost" to many of the ESPs.

the TL;DR: it was doing it's darnedest to FUBAR my MW install