I have an xvid .avi file. I also have two files by the same name with extensions .sub and .idx My question is how do I add subtitles to the .avi file? What program should I use?
Use Media Player Classic (MPC). Open the avi, go to View -> Options... Then Playback -> Output. Select VMR7 or VMR9 [renderless] in DirectShow Video. Then File -> Load Subtitle...