Thanks for your help, I didn't realise that there was also a 3x scale, because at first it wouldn't go higher than 2 (guess it was clashing with the filter I was using) but now it works (HQ filter).
No fun playing the oldies without it being fullscreen

I can't play games in fullscreen mode.
When I try to use fullscreen mode (ALT+Enter) the game is still as small as in windowed mode, just with black borders around it, it doesn't seem to stretch out to the edges of the screen. I've tried with MI 1 & 2 and Sam & Max.