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I then went back and added another instance of GTA3, this time just the plain GTA3.exe to see if that was going to open in fullscreen even with Window ticked just like the copy did earlier. That didn't really open properly unsurprisingly. I then tried running the "testapp" exe file which is in the same folder as GTA3.exe. I then tried messing with the compatibility tab in properties for the GTA3.exe file after I tried opening a GTA3 copy, but changing those settings wouldn't open so ultimately I put everything back the way it was. I ran that in DxWnd and for some reason even with Window Mode ticked it kept opening in fullscreen. I just used GTA-copy.exe and created a new profile for that copy in DxWnd. I began by doing as you suggested, copying GTA3 to another filename. It works now! I have absolutely no clue how what I did changed anything.
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