I downloaded the latest version of the plug in (v1.4) to be able to add AC3 files to my windows media player library.
I tested it on a PC with WMP10 and it worked great, after adding support for the extension following the wiki instructions, and rescanning my folder, .AC3 files were added to my library.
Then I went and did the same on a PC with WMP11, the procedure went without problem, and checking the registry it seems the keys were added, but when I rescan my folders, WMP11 never adds the .AC3 files in the library. I can still play the files, but cannot ad them to the library.

Is this a known problem, or what could be going wrong ?