[ashlar]

libdvd is not available in a x64 bit version. If you really need this you have to use the x86 version of dsplayer. If you don't need the menu of a dvd you can always play the .vobs directly. This works fine.

To clarify: using MPC-HC and playing back a DVD ISO (or launching VIDEO_TS.IFO) brings the regular DVD Menu (using DVD Navigator on x64). I honestly don't remember using this on DSPlayer but are you saying that on x86 DSPlayer behaves as MPC-HC and on x64 it can't handle it? Couldn't it use DVD Navigator as well?
Also, what's libdvd? I understand it's a library, but do you have a link for the specific one you are referring to?

Thanks!