DWM file extension - DESQview file
What is dwm file? How to open dwm files?
File type specification:
The DWM file extension is associated with the DESQview a text mode multitasking program developed by Quarterdeck Office Systems which enjoyed modest popularity in the late 1980s and early 1990s.
Running on top of DOS, it allowed users to run multiple DOS programs concurrently in multiple windows.