rename tesv to fallout3 only, do not add exe. doing this made it work for me.
This is provided you have the windows setting 'Hide all known extensions' enabled. If its disabled it will appear as .exe
Didn't do much for me, already capped at 60 but I'm on older tech (4870x2), however, no matter what I do (forced off through CC and edited the .ini) vsync won't turn off.
However, it seemed to make mouse movement a little more smoother/responsive (also turned off mouse smooth before).