My best guess is that the problem is the same as it was for Dangerous Waters; Windows 10 does not have any native backwards DirectDraw 16-bit compatibility. The DLL for Dangerous Waters was written specifically to force that compatibility.
What I suggest is an experiment.
Sub Command and Dangerous Waters are written with the same engine. Try inserting that DLL in the Sub Command directory as you did with Dangerous Waters to see if it works.
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