Dual Audio AVI joiner

Last year i was having probs with audio going out of synch on avis i joined using Vdubmod, and while searching through doom9's forum someone mentioned a free prog that could join dual audio avis and normal single audio avis which vdubmod couldn't i tried it and it worked the thing is i have been searching the forums again but cannot find any mention of the prog i have been searching for quite a few hours now, does anyone have any idea what free progs could do it ?

thanks for reply placio i have just tried it and it produced the same problem as vdubmod, ie joining 4 x 25 minute programme avis together results in the final episodes audio being out of synch, the prog i used last year looked different as well

Hmm... ...? Joined files have same properties (FPS, ...)?