Alphabetically: R
Extension File Description File Type
.r
Mac OS X Resource File
Developer
.r0
WinRAR Compressed Archive
Compressed
.r00
WinRAR Compressed Archive
Compressed
.r01
WinRAR Split Archive Part 1
Compressed
.r02
WinRAR Split Archive Part 2
Compressed
.r03
WinRAR Split Archive Part 3
Compressed
.r1
WinRAR Multi-Volume Archive Part 1
Compressed
.r1m
RealOne Streaming Media File
Audio
.r2
WinRAR Multi-Volume Archive Part 2
Compressed
.r21
WinRAR Split Archive Part 21
Compressed
.r30
WinRAR Split Archive Part 30
Compressed
.r3d
REDCODE Video File
Video
.ra
Real Audio File
Audio
.rad
Radar ViewPoint Radar Data
Text
.raf
Fuji RAW Image File
Raster Image
.ral
WinRail Track Design File
Data
.ram
Real Audio Metadata File
Audio
.rar
WinRAR Compressed Archive
Compressed
.ras
Sun Raster Graphic
Raster Image
.ratdvd
RatDVD Disk Image
Disk Image
.raw
Raw Image Data File
Raster Image
.rax
Real Music Store Audio File
Audio
.ray
Rayshade Image
3D Image
.rb
Ruby Source Code
Developer
.rb4
Resume Builder 4 File
Layout
.rbc
Retrospect Backup Catalog File
Backup
.rbf
Retrospect Backup File
Backup
.rbk
Windows 95 Registry Backup File
Backup
.rbp
REALbasic Project
Developer
.rbs
Rebirth Song File
Audio
.rbt
Lego MINDSTORMS NXT Program
Data
.rbx
Rembo-C Compiled Script
Executable
.rbxl
ROBLOX Location
Game
.rbxm
ROBLOX Model
Game
.rbxs
ROBLOX Script
Developer
.rc
Resource Script
Developer
.rcd
Arcade File
Data
.rcg
Recog Character Recognition Set
Data
.rcl
Easy CD and DVD Creator 6 Project
Disk Image
.rco
PlayStation Portable Resource File
System
.rcproject
iMovie '08 Project
Video
.rct
Visual Studio Resource Template
Settings
.rcy
ReCycle 1.x Document
Audio
.rdb
N64 ROM Database
Data
.rdf
Resource Description Framework File
Settings
.rdi
Red Dragon ISecure Settings File
Settings
.rdl
MicroStation Redline File
Vector Image
.rdlc
Visual Studio Client Report Definition File
Developer
.rdo
Xerox Rawster Document Object File
Settings
.rdp
Remote Desktop Configuration File
Settings
.rds
Ray Dream Studio Scene File
3D Image
.rdx
Reflex Data File
Data
.readme
Readme File
Text
.reb
REBOL Script File
Developer
.rec
Topfield PVR Recording
Video
.ref
Microsoft Train Simulator Reference File
Data
.reg
Registry File
System
.rel
Norton Internet Security Log File
Data
.rels
Open Office XML Relationships File
Layout
.rem
BlackBerry Encrypted Data File
Misc
.rep
Grand Theft Auto Replay File
Game
.res
Windows Resource File
Developer
.resmoncfg
Resource Monitor Configuration File
Settings
.resources
Visual Studio Resource File
Developer
.resx
.NET Managed Resources File
Developer
.ret
BusinessObjects Template
Data
.rev
RAR Recovery Volume Set
Compressed
.rex
ReCycle Loop File
Audio
.rez
Lithtech Game Engine Resource File
Game
.rf1
Retirement Forecast File
Data
.rfa
Revit Family File
Data
.rfb
RoboForm Bookmark File
Misc
.rfc
RoboForm Contact File
Misc
.rfd
Recogniform Form Designer File
Layout
.rfgs_pc
Red Faction: Guerilla Saved Game File
Game
.rfl
Reason ReFill Sound Bank
Audio
.rfm
rFactor Modification File
Game
.rfn
RoboForm Safenote File
Misc
.rfo
RoboForm Option File
Data
.rfp
RoboForm Passcard File
Misc
.rfq
RoboForm SearchCard File
Settings
.rft
Revit Family Template File
3D Image
.rfw
Rockchip Firmware File
System
.rgb
RGB Bitmap
Raster Image
.rge
Entourage File Archive
Data
.rgn
Garmin Regional Map File
GIS
.rgo
RepliGo File
Data
.rgp
RealArcade Game Package
Game
.rgs
Registry Script
Executable
.rgss2a
RPG Maker VX RGSS Encrypted Archive
Game
.rhp
Rhino Plug-in
Plugin
.rhtml
Ruby HTML Web Page
Web
.ric
NXT Image File
Raster Image
.rif
Painter Raster Image File
Raster Image
.riff
Painter Raster Image
Raster Image
.rip
Hit'n'Mix Audio Mashup File
Audio
.ris
Research Information Systems Citation File
Text
.rise
RISE Editor Model File
Developer
.rix
ColoRIX Image
Raster Image
.rjs
Ruby Javascript File
Web
.rk
WinRK File Archive
Compressed
.rkp
Rockchip MP4 Player Game
Game
.rle
Run Length Encoded Bitmap
Raster Image
.rll
Microsoft Resource Library
Settings
.rm
Real Media File
Video
.rmd
RealPlayer Media File
Video
.rmf
Rich Music Format
Audio
.rmi
RMID MIDI File
Audio
.rmj
Real Media Jukebox Audio File
Audio
.rmm
RAM Meta File
Audio
.rmp
RealPlayer Metadata Package File
Video
.rmr
ResumeMaker File
Layout
.rms
Secure Real Media File
Video
.rmskin
Rainmeter Skin File
Settings
.rmt
Router Firmware File
System
.rmuf
Alpha Five Runtime License File
Data
.rmvb
RealMedia Variable Bit Rate File
Video
.rmx
RealJukebox Format
Audio
.rnc
RELAX NG Compact Syntax File
Developer
.rnd
PGP Random Seed File
Misc
.rng
Nokia Composer Ringtone
Audio
.rnq
Renque Model File
Data
.rns
Reason Song File
Audio
.rnx
RealPlayer Settings File
Settings
.roca
RIB office Compressed Archive
Data
.rod
Actuate Report Object Design File
Data
.rog
Roger 2 Input Data File
Data
.roi
Report Object Instance
Data
.rol
Ad Lib Synthesized Instrument
Audio
.rom
N64 Game ROM File
Game
.roq
Id Software Game Video
Video
.rot
Homeworld 2 Graphics File
Game
.rou
Gerber Route File
Data
.rov
Report Object Variable
Misc
.rox
Roxio Project File
Data
.roxio
Roxio Project
Data
.rp
RealPix Clip
Video
.rp2
RetroPlatform Player Program Archive
Game
.rp9
RetroPlatform Disk Image Archive
Compressed
.rpa
RIB Project Archive File
Data
.rpb
Radmin Phonebook File
Settings
.rpd
Roleplay Designer Data File
Data
.rpj
Real Pac Batch Job File
Executable
.rpk
RadLight Media Player Skin
Settings
.rpl
Toribash Replay File
Game
.rpm
Red Hat Package Manager File
Compressed
.rpp
REAPER Project File
Data
.rps
3ds Max Render Preset Settings
Settings
.rpt
Crystal Reports File
Data
.rptr
RafflePrinter Document
Layout
.rpy
Python Script
Developer
.rpyc
Ren'Py Compiled Script
Game
.rrr
Registry Mechanic Backup File
Backup
.rrt
Rhapzode Resource Template
Data
.rsb
Red Storm Bitmap File
Raster Image
.rsc
Symbian Application Compiled Resource File
Data
.rsd
RealSQLDatabase File
Database
.rsdf
RapidShare Download File
Encoded
.rsm
WinWay Resume Deluxe Resume File
Layout
.rsn
Reason Project File
Audio
.rso
NXT Brick Audio File
Audio
.rsp
RSLogix PLC Program File
Data
.rsr
Poser Model Preview File
Raster Image
.rsrc
Macintosh Resource File
Developer
.rss
Rich Site Summary
Web
.rst
reStructuredText File
Text
.rsv
RSView32 Project File
Data
.rsw
R&R SQL Report Writer Report File
Data
.rt
RealText Streaming Text File
Text
.rtc
Live Meeting Connection File
Misc
.rtd
RagTime Document
Text
.rte
RTE Encoded File
Compressed
.rtf
Rich Text Format File
Text
.rtfd
Rich Text Format Directory File
Text
.rti
Real Tracker Instrument
Audio
.rtm
Real Tracker Module
Audio
.rtp
TurboTax Update File
Misc
.rts
RealPlayer Streaming Media
Video
.rtx
Rich Text Document
Text
.ru
JavaSoft JRE 1.3 Library
Developer
.ruf
Samsung DVD and Blu-ray Player Firmware File
System
.rul
InstallShield Rules
Developer
.ruleset
Visual Studio Code Analysis Rule Set File
Settings
.rum
Bink Video Subtitle File
Video
.run
Linux Executable File
Executable
.rv
Real Video File
Video
.rvdata
RPG Maker VX Data File
Game
.rvproj
RPG Maker VX Project File
Game
.rvt
Revit Project File
Data
.rvx
Real Protected Video File
Audio
.rw2
Panasonic RAW Image
Raster Image
.rw3
RapidWeaver 3 Site File
Web
.rwg
Random Word Generator Project File
Data
.rwlibrary
Paperless Receipt Library
Misc
.rwp
RapidWeaver Package
Web
.rwsw
RapidWeaver Site File
Web
.rx2
REX2 Audio File
Audio
.rxdata
RMXP Data File
Game
.rxe
Lego Mindstorms NXT Executable Program
Executable
.rz
Rzip Compressed File
Compressed
.rzb
Red Zion Book File
Data
.rzk
File Crypt Password File
Text
.rzn
Red Zion Notes File
Text
.rzs
Red Zion Security File
Compressed
.rzx
File Crypt Encrypted File
Encoded