Fallout 3: Save Game File?

Does anyone know what file is the save game file?

I'd like to save it, in order to go back to certain specific save points and do things differently, without having one-hundred more saves heaped on top of the numerous saves I already have, so I can just re-import it if I need/want at some point.

Thanks.

C:\Users\USERNAME\Documents\My Games\Fallout3\Saves

Ah, thanks... installed in a totally different place.