Nod! I have zero faith in Codemasters giving any support to their old titles.
I don't recall Dirt 2's level of GFWL integration...
Some GFWL games don't actually require GFWL at all... e.g. my Fallout 3 retail CD, I could simply avoid signing into GFWL and still play and save (w/o even a GFWL offline profile.)
I'm assuming that an offline profile will be sufficient for most single player games (on that same computer/os).
Well at least there is some hope down the road as Codemasters recently confirmed that they are working on patching GFWL out of DiRT 3 and migrating it to Steamworks. If that goes well, they might continue with their older titles as well.