File "C:\...\filename.avi" can not open, or unsupported. When I Try to convert an .avi file to MPEG-1 using TMPGEnc Plus 2.5 I receive this error message when I try to convert an .avi file to MPEG-1 using TMPGEnc Plus 2.5 software: File "C:\...\filename.avi" can not open, or unsupported. I try changing the priority from -1 to 2 but the same error message appear. I change the priority on Main Window menu; Option; Enviromental Setting; VFAPI plug-in then I right click Direct Show Multimedia File Reader and select a Higher priority until set the priotiry no. to 2 and the line is at the top of the list, but the error messege appear again. How can I solve this? If you know the answer please be specific and clear because is my first time converting form avi to MPEG-1.