There are a couple of apps that allow you to change the resolution of your screen "automagically" before and after you run the app. If you copy it to your desktop (no installation needed) you can run it and specify the target application (then make a shortcut, that would look like the original one, and it will run seamlessly from there) and it will:
- Change the resolution to (640x480, 800x600, or whatever fits your needs).
- Run the app at that resolution.
- When you close the app, it will revert automatically to your original resolution.
One of the apps is called Qres (quickres, probably). I cannot remember the other one, but if you google Qres, the other one would appear as an alternative (and both are freeware, as far as I know).
Now, I also know, that one of those apps can integrate with the system and give you an extra tab (called Qres). So you would end up having something like this "General, Compatibility, Details, Security, QRes, ... etc".
It is what I use to work with those apps, and I rarely had any problems (you know, windows + freeware, every once in a blue moon has issues. But generally, it works!)
PS: And setting it up is quite easy - we are talking about 12-16 settings at most (including the list of resolutions).
PS2: Thanks Zero Piraeus for your corrections. As you can see English is not my native language (Unfortunatelly I only speak it as second language with French, being Spanish my native one). Still I dont get the vote down. I forgot to write PS (Post Scriptum) instead of PD (Post Data) which is use in my native language (and also in French). Amongst other small mistakes for fast typing, sorry about that. Also you removed my "@name" from my comment, while there was a couple of those in other comments. (Im just a bit puzzled, speacially for the vote down).