I got finally golden gun working at 640x480.
first I tested dxwnd, but no luck, after that I discovered autosizer, wich resize it nice.
For me it works with tp 0.8, 1.01 and 10.2.
I had some troubles with the keys, like Tomkun, but not exactly:
Without Demulshooter, keys only work if I check "Use mouse", "use keyboard" doesnt seem to do nothing for me, even after "remap keyboard".
With demulshooter, keys work nice, 8 for coins, 1 and 2 for start. ( in tp "Use mouse", "use keyboard" unchecked)
The only problem now is I cant get into test mode, with nor without demulshooter. I tried thought DumbJVS Manager, checking "test menu", and it says "unable to find "gametest.exe".
In my sgg folder, Inside exe folder, I have "Testmode.exe", I tried renaming it but no luck