R Pegasus Mail resource file

RA Real Audio sound

RAM Real Audio sound

RAS Sun Raster Images bitmap

RAW Raw File Format (bitmap)

RC Microsoft Visual C++ Resource Script

REC Recorder macro

REG Registration file

RES Microsoft Visual C++ Resource

RFT RFT-DCA

RLE Run-Length Encoded bitmap

RM Real Audio video file

RMI MIDI music

ROV Rescue Rover data file

RPT Microsoft Visual Basic Crystal Reports file

RTF Rich Text Format document

RTM Real Tracker music module (MOD) file