Media Player Home Cinema Blu-ray

First of all, do you mean DVD or Blu-ray? Because they are entirely two different beasts. For one, the DVD structure has been supported for ages, but Blu-ray is really new, and it's method of navigation is not supported in full yet by any free player that I know of. However, if you just want to play the main movie (even if it is split-in-two) then just navigate to the main movie folder in windows, select the two biggest files, and drag and drop them into the Media Player Classic HC playlist.

i mean blu-ray. thanks for the tip with those two files. unfortunatly its not only two files. i have "wall-e" on blu-ray and those are numerous files of every size that represent the whole movie :(

File / Open DVD on the root of you BRD will automatically detect the main movie, and even made a playlist if the main movie is in 2 parts ;)

hmm yeah...that would work, tried that and no probs actually. but my overall goal was to use the blu-ray out of the drive ;) cause i don't wanna convert n stuff.