This posting is older than 6 months and can contain outdated information.
Hello Flavio,
thanks for asking.
The Mplayer Behaviour is not broken. In fact, it didn't change at all
in Preview 10b. And since Remote Buddy is already using the version
you tried to install from inside Remote Buddy's bundle (which, btw,
you shouldn't do), it also acted correctly by bringing up the dialogue.
If the Mplayer Behaviour does not turn up in Remote Buddy's
Preferences, Mplayer was not found through Launch Services (a system
level service by OS X).
You can use LSRefresh from here:
http://www.iospirit.com/index.php?
mode=view&obj_type=blog&obj_id=2&o_blog_dmode=view&o_blog_entry=79
to refresh / add an entry for Mplayer in your LS database. Just fire
up LSRefresh, select "MplayerOSX.app" in the dialogue, let LSRefresh
update your Launch Services database and restart Remote Buddy
afterwards and the problem should be gone.
You can also try to use OnyX to entirely rebuild your Launch Services
database. However, I never did the latter, so no guarantee for that
way from my side.
Hope that helps.
Best regards,
Felix