Making Fonts Doubleres-compatible

[Lime]

Alright, I want to make the fonts of the Unknown Screenpack bigger so I can use them with Doubleres=4 without them being tiny. I'm not using the hi-res hack. I tried just doing it via a .Fnt Editor, but the result was that when I tried to play them in Mugen, it crashed. I only edited the size.

How would I go about editing the .fnt files to make this possible? If it is possible, that is?