If there were only a button: "Make the styling like Windows XP"...
You still can't get sharp corners on Windows unless you break the system transparency.
And a new gripe. If you have an older app and try to display it on a laptop or something with greater than 96 DPI Windows will say, "Oh, that poor app won't understand 144 DPI (or whatever), I will scale the video so that it's all blurry!".
So when you run your old app and you say, "I thought that it looked sharper than that", that is what is happening. You can apparently set per-app compatibility, or regenerate the app with a manifest that says that it understands DPI or in code:
Code:
SetProcessDpiAwareness(2);