So this trick allows you to change the font size of the menus.
This works in some programs, not in others, it does in painter which uses windows fonts.
This only works in Windows 8 or 10, 7 doesn't allow you to change global font size afaik.
Right click your wallpaper.
Go to Personalize.
Go to DISPLAY at the bottom left.
Then change the menu font size (you can also Bold it).
So now you can change the fonts in Painter from tiny to really large and bold it.
It's kind of handy, especially if you use a projector / TV / large screen, and sit at a distance.