A totally awesome, fantastic, supercalifragilisticexpialidocious, well it's DAMN good! [Wroks in 2.80 beta).
I downloaded a few fonts (TrueType, .ttf). Opened two file Explorer processes as administrator. Copied (only choice) the TTF's to the Windows/Fonts directory, and when trying to use them in Blender, they don't show-up! I even tried turning off the "Filter" option (top of window).
Weird. Gotta love Windows, eh?