I am trying Cakewalk (free) as an audio editor for the time being and have been trying to set it up as an external editor both in Vegas Pro 18 and Movie Studio 16 Platinum. When I try to open a copy of an audio file in an external editor (Cakewalk), I get the same results for both programs. Cakewalk's response is "Could not open file. The file may be damaged or incompatible with this version of Cakewalk."
This seems strange as I have never encountered this in any other audio package.
When I take the mp4file from the media pane and drags it into Cakewalk it imports it just fine, and shows both the video and the audio.
Any suggestions?