Can you open a ".prel" file, created in Premere Elements 9 Mac, in Premiere Pro CS5 Mac? When I try it says the file was created in a version of Premiere before CS3. I only found this thread:
but that's before Premiere Elements 9 for Mac came out..
If the .prel file was created on a PC, you will not be able to open it on a Mac.
PC .prel files can often be opened on the PC version of Premiere Pro. I don't know that this is true on the Mac versions, however.
Thanks. I finally found it in the docs:
Supported video project file formats
PREL (Adobe Premiere Elements project) (Windows only)
So it looks like Mac PREL (Elements 9) isn't supported by Pro CS5.