There's this game I'm playing which uses raster graphics, but it is not suited for high resolution because the text is too small. In GNOME I would have been able to use Compiz scale effect to solve that, albeit being blurry. Seeing Windows Vista and 7 (excluding Basic editions) come with DWM, I suppose it should be possible to utilize it to scale any window up. In fact, that's what I see when I run non-DPI-aware application on desktop set to high DPI.
There's something called DWM Scaler Power Toy but I have no idea what it does, since I never manage to download it without errors.
P/S: Alternatives to avoid:-
- Changing resolution: most LCD monitors don't look good on non-native resolution
- Playing on VM: Startup time prolonged
- Dual-boot: Well, I've heard of people rebooting from Linux to Windows to play games, but the other way around? You've gotta be kidding me!