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RIPscrip Icon	RISC OS	RISC OS filetype
RJCRUSH	RK	RKIVE
RKUC	RK Audio	RK Image
RLA	RLE	RLE90
RLE (cellular automata)	RLF	RLI
RLL encoding	RMC	RMFF
RNA	RNC	ROFF
ROM	ROM Images	ROM and memory images
ROOT	ROT-13	ROT13
ROX	ROXIO	RPG
RPM	RPT	RPT (OpenLynx)
RRD	RRIP	RSA private key
RSC32	RSS	RSteg
RTCP	RTF	RTFD
RTP	RTPatch	RUN Paint
RW2	RZX	Racket
Radiance HDR	Radiance Scene Description	Radio
Radio-frequency identification	Radio Data System	Ragnarok Online 2 RMP
Ragtime	Rainbow Painter	Raku
Random Access Memory	Ransomware	Rant
Raspberry Pi	Raster Master RAW	Ratfor
Raw Bitmap Font	Raw FL Studio Project	Raw bitmap
Raw disk image	Rawzor	Ray Dream
Rayshade Heightfield	Rayshade scene description	ReCap
ReFS	RePub	ReStructuredText
ReStructuredText/spec	React	ReactOS
Read Only Memory	Ready, Set, Go!	Reaktor
RealAudio	RealMedia	RealMedia Variable Bitrate
RealVideo	Real Tracker module	Realia Spacemaker
Reality AdLib Tracker	Reality AdLib Tracker module	Reason Studios REX2 Audio File
Record	Recovery Star	Red Button Text
Redcode	Redo	Reduq
Reed-Solomon error correction	RefMan	Regin
Registry:fmt/111	Reiser4	ReiserFS
Rel-author	Rel-home	Rel-license
Rel-nofollow	Rel-payment	Rel-tag
Relocatable Object Module Format	Rembrandt	Rename helper
RenderWare binary stream file	RenderWare object	Renoise
Renoise DSP device-chain	Renoise instrument	Renoise song
Resource	Resource Description and Access	Resource Fork
Resources	ResponseCard RF	Restic
Retail sales	Retrospect	Reunion
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