It appear that Replay Media Catcher will not convert any video/music file with the same file extension. The problem is there are a variety of .AVI video formats such as (XviD, DIVX, mjpeg, mpeg4 and ect that use .AVI so this type so this restriction should be removed from the program. It would a good thing if you are able to convert a file extension to the same file extension since the same extension has several codecs.