There was a thread on this a couple of years ago, but I couldn't find any solution:
This gist of the last thread was that when trying to open multiple selected raw files from PM into Photoshop Elements, Elements started but no files opened.
I have PM and Elements on my Macbook Air and the multiple files open fine, but when a friend with a Windows machine tries the same thing, he gets the same result as described in the thread two years ago, Elements open up but nothing else happens.
Per