I just bought adobe premiere elements 13. I hoped that it would help to open an avi on my brand new Mac, which iMovie of course did not open. (That's why I spend the money on premiere!) I got the file from a disc, and I don't know what kind of camera took the pictures. Premiere 13 should open AVI's. What is wrong?
Premiere Elements 13 Mac should be an .avi import only. But, avi is just a file extension (container/wrapper format), which wraps the video and audio compressions of the file.
Although the program might support a particular video compression and a particular file extension (container/wrapper format), it may not support the combination of a particular combination of video compression with file extension for a file.
What are the properties (video compression et al) of your video file with the file extension of .avi?