Under Ash

Report of the game on a modern system with the freeware version recently posted in Victory Castle thread.

Windows was being a bit of a bitch and wouldnt install the game to the directory I selected. Windows would think I installed the game to directory which I launched the installer from. Fooled around and got the game to behave at last. Changed the shortcut from the wrong directory to where I actually installed the game. Check if all the levels loads with the included savefile. The game creates a savefile here: C:\UAGAME
There is a bug with the complete savefile I didnt managed to fix, the problem being that it wont detect the mouse.

The only problem now is that the game randomly decides to return to the main menu in the middle of gameplay, with no way to get back into the action.

Got the movies to display with this codec. I dont think running the installer is needed, but copying the codec dll and registering it is. Depending on your windows version the dll might already be in your windows/system 32 directory as part of legacy support.

Indeo IV50 AVI Codec - Resources - Rock Raiders United

I think you should end up with a folder structure as one below, at least all the levels will load when it is like that.

I have yet to check out the game in Windows XP, so it may very well work as intended there.

Incase the installer wont create a shortcut for you:
C:\games\underash\UNDERASH.exe /Play
C:\games\underash