PG Uber runs on a combination of extensions to build the game you want to play. What you need to do is have Vassal create an extension folder. So do this:
- Start Vassal
- Right-click on the PG Uber entry.
- Choose Add Extension from the drop-down menu.
- Pick any of the vdmx files you have (apparently in your PG Uber folder)
Vassal will create an extensions folder in your PG Uber folder and move the vmdx file (the extension) into that folder.
Now you can add the other extensions to that folder using the Add Extension function from the drop-down menu, or you can use Windows Explore to move them into the folder Vassal created.
Now when you run the PG Uber module, it will load the extensions in the extension folder and your game is playable.