Windows 10 Having Compatibility Problems

I own a copy of Dawn Of War: Soulstorm. It has been modded, using Ultimate Apocalypse.
I've owned this game since Windows 7, and it has worked on both Windows 7 and Windows 10, I've never had an issue with it. Today, whenever I try to run DoW, it complains that I need Windows 90Se, 2000 better. I've tried restarting and running all the compatibility patches in the troubleshooter, none of which have worked. No updates have occurred between when it was working and now. No updates on THQ's end that I know of, as they've been bust for a while but recently brought up. Any help would be appreciated, because this game has been basically my childhood.
try enable the older if you have not done that yet.
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