(There's no video for rFonts (Russian font suitcases) yet. Please contribute to MR and add a video now!)
rFonts is just a folder containing the following font suitcases supporting the Russian alphabet:
(1.66 MiB / 1.74 MB)
rFonts for Mac OS 6.x - Mac OS 9.2.2 / compressed w/ Stuffit
Mac OS 6.x - Mac OS 9.2.2
Those are fonts, to install them, drag and drop them on your System Folder and accept when it asks to place them in the Fonts folder.
Emulating this? It could probably run under: SheepShaver