i used to be able to insert 2DV files into tmpg but now i cant (after formatting )

so what do i do to get tmpg to reconise 2dv files again...ive got a few version of the prog but it just wont acept them....please help

(2dv files are created when using dvd2avi,savein g project))

btw, if its allowed a link would be great please
thx again
Nifty