I am sure people may have figured this one out, but here goes.
If you would like to play all the music the new WinAmp can play, best thing to do is copy the Plugin folder from a install of that WinAmp and place it into the ME folder. This is how I got ME to play aac. I tried just putting the new WinAmp in the ME folder, but it says it must use WinAmp 2.8.1. But, just taking that Plugin folder seems to have solved that AAC problem. I wonder if there would be a way to get the crossfader to work?