"Disable desktop composition" for 64-bit programs?

[GotNoRice]

I've noticed that when you have a 64-bit program, and try to enable the "Disable desktop composition" option in the compatibility tab of the options, it simply does nothing (doesn't disable desktop composition).

Doing this with a 32-bit app/game works as intended.

I just got a GTX680, and I'm trying to work around the known bug that is causing my 2nd monitor to go black every time I launch a game with Aero enabled. The easiest way to do this is to select the "disable desktop composition" option for each game that I play. But some of the games I play now use 64-bit executables.

 

[GotNoRice]

I managed to come up with a somewhat ghetto yet effective workaround, which others might find useful if they encounter the same problem: making a batch file.

For example, for World of Warcraft (which can use a 64-bit exe now), I made this batch file in the WoW directory:

start Wow-64.exe /wait
net stop "UxSms"
pause
net start "UxSms"

I'd still be interested in solving the underlying problem instead of using the workaround if anyone knows exactly why this behavior occurs.