http://www.geocities.jp/menopem/ (first link)
Edit: I found a version where the options are in English, you’ll want this one:
Okay, so the program is all in moonspeak, but the basic usage is relatively simple.
- Run D3DWindower.exe
- Click the ‘+’ button, and navigate to the .exe file you want run windowed (you can also select a shortcut to said .exe)
- Click the ‘>’ button.
- Run the game normally.
From what I can tell, if you right click on one of the games you add and select the first option, on the first tab there should be two input boxes with ‘0’ in both of them, I believe this is what you would change if you want to force the window to have a different resolution.
I’ve got it working with Fallout 2 and Starcraft so far, but that’s all I’ve tried