You can probably create fake 5.1 just like you could make a mono file into a "stereo" one. But you of course can't extract real 5.1 information from a stereo track.
Yeah, I figured that. I'm wondering if there is a plugin or a stand-alone app that will allow you to do this. Maybe even allow to choose which channel you want the left/right channel to got to. Fake will do. Where is this software?