I have looked at GIMP and Paint.net and it it is obvious that for a simple paint program they have suffered from extreme featuritis. They are way more complicated than I need or want. Also, some of the programs I use automatically use MSPaint for image editing. Plus MSPaint, for getting things done quickly, is the easy, quick and dirty solution.
And it is NOT the fonts themselves. They work in every other program EXCEPT MSPaint and MSWordpad so far as I know. Wordperfect, Editpad, Open Office, etc. are all able to use ALL the fonts.
You can't even ask Microsoft Support about this unless you PAY them...