Okey I found out the solution: Basiclly the installer download and setup the cutscenes. If you have a look into the library the installer really downloaded the cutscenes but the file sizes are zeros. So need to mount the original disc images or put the disc in optical drive and copy the content pf movie folder to the Dune2000 Gruntsmod/movies folder and rewrite the fake files.
1. Install the gruntsmod edition
2. let the installer download and setup the cutscenes/cinematic files (it will download fake files with zero sizes)
3. mount the original disc image file (with daemon tools for example)
4. copy content of the "ISObin:\movies" folder to XY:\Gruntmods Studios\Dune 2000\movies (rewrite all)
5. play with cutscenes at now!
