I have been using Adobe Audition 1.5 for many years until my pc crashed some weeks ago. Had to start from scratch again! Fortunately I backed-up my Audition 1.5 version and it seems to be running now like before, except for one thing: Open audio from video (like mp4)isn't possible anymore. I get the message:
The selected file is not a supported video file format or the video codec required to open this file was not found.
I searched everywhere (even installed Quicktime) but still in vain.