The corresponding files
arial10.font
...
Younameithere.ttf
go to this direction in #DBW:
D:Ubisoft\IL-2 Sturmovik 1946\#DBW\HUD\font
If you Don't have HUD folder and font subfolder, create it.
Play with the sizing, scale and Fontsize must be adjusted manually regarding the Font you want to use.
Warning, 90% of the Fonts out there are missing Characters, beware if you use Forgotten Countries or foreign Language GUI outlook.
My dream one day, let IL-2 use otf/Open Type Font format, and it's breaking boundaries, otf is capable all-in one. Including japanese, corean, chinese and lots of others.