There is a small support application available to be able to use the MCE-Remote with AlbumPlayer. With introduction of AlbumPlayer V.5 this support application is not always necessary since for several keys, the remote sends multimedia commands which can be handled directly by AlbumPlayer. But there are also buttuns like "Info" and the four colored buttons, which have a special meaning in AlbumPlayer that should be handled with this special add-on. Also an advantage of this add-on is that you can still control AlbumPlayer, even when switched to the desktop of another user. This would not work with only multimedia key support. Please check out this topic
for a download link and additional info.