@meynaf:
I found that there is an FF program in 1.3 C: drawer. I copied it over to 3.1 C: drawer, and the command works, I can pass it a font in .font format (I used topaz.font contained here:
http://aminet.net/package/util/wb/RetroWB), but the console does not seem to change, it does not change to TOPAZ font, the default 3.1 font remains.