I have tried 2 versions one has been modified and is the one that is supposed to work for Tandy sound. It is in the SW1 folder with 3 sub folders labeled D, DOCS, and FM. The other looks more like the original game with the 3 different installation programs, the sentinel.bat and 2 folders, fmdat and fmplay. The modified program I have copied to my C drive/ I launch DOSBOX and mount c c:\SW1, when I change directories and try to launch the game I get the disk message. The other version does nothing when I try to launch it.

Ok a friend emailed me how he got it working, thanks for trying.

Posting the solution to your problem might help the next person who runs into this problem as well.

If I'm not mistaken, the problem is precisely the one described and solved on the previous page.