I know that Plutonium uses their own servers than steam however I own the actual copy of MW3 + DLCs and wanted it to clock hours via STEAM however.. I had to rename the original exe and use that name for Plutonium's exe just so steam could register that I have the game open. (I had to place Plutonium into my steam directory where the game is installed) My issue or concern here is that I had just re-named the legitimate exe and swapped it with a third-party. Could this cause a VAC? or because I am not "actually" playing said game, it won't use the VAC system when I have said game open to clock hours? Just want to be safe since I already have 1 VAC on my account (MW2 which is like 3,000 days old) due to file modifications.. granted I did have some fun with friends in modded lobbies and got reported by them.
EDIT: Spelling error as well as forgot to mention this was put into my game folder.