.r8p - LaserJet portrait font ( file extension )

.ra - RealAudio

.ram - Real Audio ( file extension )

.ras - Raster graphics - Sun ( file extension ).

.raw - Raw file format - bitmap (filename extension).

.rc - A filename extension found in many UNIX files (.newsrc, etc.) which means "run commands".

.rec - Windows Recorder macro file (filename extension).

.reg - Registration file (filename extension).

.rep - Report file (filename extension).

.rft - RFT-DCA (filename extension).

.rgb - An SGI RGB image file

.ria - Alpharel Group IV raster graphics

.rib - Renderman graphics

.ric - Roch FaxNet

.rif - Fractal Painter bitmap (filename extension).

.riff - Resource Interchange File Format A multimedia file format; the Microsoft equivalent to Amiga IFF format.

.rix - RIX virtual screen

.rla - Wavefront raster image

.rlc - CAD Overlay ESP - Image Systems

.rle - Run Length Encoded

.rm - Real Media ( file extension ).

.rmi - RIFF MIDI file

.rnd - AutoShade format

.rnl - GTX Runlength raster graphics

.rpt - Report file ( file extension ).