File extension	The full name of the file	Popularity
File extension R	Rez Source Code File
File extension R0	WinRAR Compressed Archive
File extension R00	WinRAR Compressed Archive
File extension R01	WinRAR Split Archive Part 1
File extension R02	WinRAR Split Archive Part 2
File extension R03	WinRAR Split Archive Part 3
File extension R1	WinRAR Multi-Volume Archive Part 1
File extension R1M	RealOne Streaming Media File
File extension R2	WinRAR Multi-Volume Archive Part 2
File extension R21	WinRAR Split Archive Part 21
File extension R30	WinRAR Split Archive Part 30
File extension R3D	REDCODE Video File
File extension RA	Real Audio File
File extension RAD	Reality AdLib Tracker 2 file
File extension RADIUMKEY2	Radium 2 License File
File extension RADQ	Need for Madness Game Archive
File extension RAF	Fuji RAW Image File
File extension RAL	WinRail Track Design File
File extension RAM	Real Audio Metadata File
File extension RAR	WinRAR Compressed Archive
File extension RAR5	WinRAR Compressed Archive
File extension RAS	Sun Raster Graphic
File extension RASKINLICENSE	Raskin License File
File extension RASKINPLACE	Raskin Place Layout File
File extension RAT	PICS Rating File
File extension RATDVD	RatDVD Disk Image
File extension RAV	FIFA 2001 data environment file
File extension RAW	Raw Image Data File
File extension RAX	Real Music Store Audio File
File extension RAY	Rayshade Image
File extension RB	Ruby Source Code
File extension RB4	Trend AntiVirus backup file
File extension RBC	Easy Resume Creator Pro resume file
File extension RBF	Windows Installer Rollback File
File extension RBJ	XRK Compiled Redcode Object File
File extension RBK	Windows 95 Registry Backup File
File extension RBP	Real Studio Project File
File extension RBS	Rebirth Song File
File extension RBT	Lego MINDSTORMS NXT Program
File extension RBVCP	Real Studio Version Controlled Project
File extension RBX	Rembo-C Compiled Script
File extension RBXL	ROBLOX Location File
File extension RBXM	ROBLOX Model
File extension RBXS	ROBLOX Script
File extension RBZ	Rail Baron Player saved game file
File extension RC	Resource Script
File extension RC1	Samsung Mobile Device Firmware File
File extension RC2	Visual Studio Resources File
File extension RCD	pcAnywhere Recorded Session File
File extension RCF	Prototype game file
File extension RCG	Netscape newsgroup file
File extension RCL	Easy CD and DVD Creator 6 Project
File extension RCO	PlayStation Portable Resource File
File extension RCS	RandomControl Scene File
File extension RCT	Visual Studio Resource Template
File extension RCU	RealWorld Layered Cursor Image
File extension RCX	REDCINE-X Project File
File extension RCY	ReCycle 1.x Document
File extension RDA	R Data File
File extension RDATA	R Workspace File
File extension RDB	N64 ROM Database
File extension RDC	IDRISI Raster Documentation File
File extension RDF	Resource Description Framework File
File extension RDI	Rohos Disk Image File
File extension RDL	Corel Paradox file
File extension RDLC	Visual Studio Client Report Definition File
File extension RDLX	Power View Project File
File extension RDO	Xerox Rawster Document Object File
File extension RDP	Remote Desktop Configuration File
File extension RDS	Ray Dream Studio Scene File
File extension RDX	Reflex Data File
File extension README	Readme File
File extension REB	REBOL Script File
File extension REC	Topfield PVR Recording
File extension RECORD	GarageBand Records Audio File
File extension RED	CADViewer Redline Markup File
File extension REDIR	Spotify Executable Redirect File
File extension REF	Microsoft Train Simulator Reference File
File extension REFERENCE	Budget In Brief Reference File
File extension REFRESH	Visual Studio Refresh File
File extension REG	Registry File
File extension REGTRANS-MS	Registry Transaction Log File
File extension REL	Norton Internet Security Log File
File extension RELOC	Windows EXE Relocation Section File
File extension RELS	Open Office XML Relationships File
File extension REM	BlackBerry Encrypted Data File
File extension REP	BusinessObjects report file
File extension REQ	SSL Certificate Request File
File extension RES	C++ Complied Resource Script
File extension RESJSON	Windows JavaScript Resources File
File extension RESMONCFG	Resource Monitor Configuration File
File extension RESOURCES	Visual Studio Resource File
File extension RESW	Windows Resources File
File extension RESX	.NET Managed Resources File
File extension RET	RETScreen project file
File extension REV	RAR Recovery Volume Set
File extension REX	ReCycle Loop File
File extension REZ	Lithtech Game Engine Resource File
File extension RF1	Retirement Forecast File
File extension RFA	Revit Family File
File extension RFB	RoboForm Bookmark File
File extension RFC	RoboForm Contact File
File extension RFD	Recogniform Form Designer File
File extension RFGS_PC	Red Faction: Guerilla Saved Game File
File extension RFL	ANSYS file
File extension RFM	rFactor Modification File
File extension RFN	RoboForm Safenote File
File extension RFO	RoboForm Option File
File extension RFP	RoboForm Passcard File
File extension RFQ	RoboForm SearchCard File
File extension RFT	Revit Family Template File
File extension RFW	Rockchip Firmware File
File extension RGB	RGB Bitmap
File extension RGE	Entourage File Archive
File extension RGMB	RootsMagic Backup File
File extension RGMC	RootsMagic Genealogy Project File
File extension RGN	Garmin Regional Map File
File extension RGO	RepliGo File
File extension RGP	RealArcade Game Package
File extension RGRP	Pro Tools Region Group File
File extension RGS	Registry Script
File extension RGSS2A	RPG Maker VX RGSS Encrypted Archive
File extension RHISTORY	R History File
File extension RHP	Encore file format file
File extension RHTML	Ruby HTML Web Page
File extension RIC	NXT Image File
File extension RIF	Painter Raster Image File
File extension RIFF	Painter Raster Image
File extension RIG	LightWave 3D RIG function file
File extension RIM	BioWare Resource Image File
File extension RIS	Research Information Systems Citation File
File extension RISE	RISE Editor Model File
File extension RIX	ColoRIX Image
File extension RJS	Ruby Javascript File
File extension RK	WinRK File Archive
File extension RKP	Rockchip MP4 Player Game
File extension RL	R.viewer List File
File extension RLE	Run Length Encoded Bitmap
File extension RLEGZ	Golly Compressed Simulation Pattern File
File extension RLF	ArcGIS Report Layout File
File extension RLI	RealWorld Graphics Layered Image
File extension RLL	Microsoft Resource Library
File extension RLS	RadLight skin file
File extension RM	Real Media File
File extension RMBAK	Registry Mechanic Backup File
File extension RMD	RED Metadata File
File extension RMF	Adobe Rights Management Document
File extension RMI	RMID MIDI File
File extension RMJ	Real Media Jukebox Audio File
File extension RML	Redline Markup Language File
File extension RMM	RAM Meta File
File extension RMP	RealPlayer Metadata Package File
File extension RMR	ResumeMaker File
File extension RMS	Secure Real Media File
File extension RMSKIN	Rainmeter Skin File
File extension RMT	Router Firmware File
File extension RMUF	Alpha Five Runtime License File
File extension RMV	The Simpsons Hit & Run Video File
File extension RMVB	RealMedia Variable Bit Rate File
File extension RMX	RealJukebox Format
File extension RNC	RELAX NG Compact Syntax File
File extension RND	AutoCAD Autoshade rendering slide file
File extension RNG	Random Number Generator data file
File extension RNQ	Renque Model File
File extension RNS	Reason Song File
File extension RNX	RealPlayer Settings File
File extension ROCA	RIB office Compressed Archive
File extension ROCK	Rockbox Plug-in
File extension ROD	Actuate Report Object Design File
File extension RODL	RemObjects Definition Language File
File extension ROG	Roger 2 Input Data File
File extension ROI	Report Object Instance
File extension ROL	Ad Lib Synthesized Instrument
File extension ROM	N64 Game ROM File
File extension ROQ	Id Software Game Video
File extension ROS	Dynamite VSP rail object style file
File extension ROT	Homeworld 2 Graphics File
File extension ROTEST	RemObjects SDK Test File
File extension ROTESTRESULT	RemObjects SDK Test Results File
File extension ROU	Gerber Route File
File extension ROV	Report Object Variable
File extension ROX	Roxio Project File
File extension ROXIO	Roxio Project
File extension RP	Axure RP Project File
File extension RP2	RetroPlatform Player Program Archive
File extension RP9	RetroPlatform Disk Image Archive
File extension RPA	RIB Project Archive File
File extension RPB	Radmin Phonebook File
File extension RPD	Roleplay Designer Data File
File extension RPF	Rich Pixel Format File
File extension RPI	Render Plug-in
File extension RPJ	RealPlayer JavaScript file
File extension RPK	NeverForget backup reminder file
File extension RPL	Toribash Replay File
File extension RPLIB	Axure RP Widget Library File
File extension RPM	Red Hat Package Manager File
File extension RPMSG	Outlook Restricted Permission Message
File extension RPP	REAPER Project File
File extension RPPRJ	Axure RP Shared Project File
File extension RPS	3ds Max Render Preset Settings
File extension RPT	Crystal Reports File
File extension RPTR	RafflePrinter Document
File extension RPY	Python Script
File extension RRA	Windows Installer temporary file file
File extension RRD	Reduced Resolution Dataset File
File extension RRI	RealWorld Image
File extension RRR	Registry Mechanic Backup File
File extension RRT	Rhapzode Resource Template
File extension RS	Sun raster bitmap image file
File extension RS2	RailSim2 Saved Layout File
File extension RSA	RSA Certificate File
File extension RSB	Red Storm Bitmap File
File extension RSC	Resource file
File extension RSD	RealSQLDatabase File
File extension RSDF	RapidShare Download File
File extension RSM	ReliaSoft MPC 3 file
File extension RSN	Reason Project File
File extension RSO	NXT Brick Audio File
File extension RSP	Linker response file
File extension RSR	Poser Model Preview File
File extension RSRC	Macintosh Resource File
File extension RSS	Rich Site Summary
File extension RST	reStructuredText File
File extension RSV	RSView32 Project File
File extension RSW	R&R SQL Report Writer Report File
File extension RSX	RED Metadata XML File
File extension RT	RealText Streaming Text File
File extension RTA	IBM Voice Type languages vocabulary file
File extension RTC	AutoCAD Civil rating curve data file
File extension RTD	Retina Network Security scanner output file
File extension RTE	OziExplorer route file
File extension RTF	Rich Text Format File
File extension RTFD	Rich Text Format Directory File
File extension RTI	Real Tracker Instrument
File extension RTM	LabVIEW Run-Time Menu File
File extension RTP	Microsoft software update file
File extension RTS	Resource Tuner Console script file
File extension RTSTN	Audials Station File
File extension RTWSH	Radiotracker Wishlist File
File extension RTX	Rich Text Document
File extension RU	Java Russian Font Properties File
File extension RUF	ProWORX tables reference file
File extension RUL	InstallShield Rules File
File extension RULESET	Visual Studio Code Analysis Rule Set File
File extension RUM	Bink Video Subtitle File
File extension RUN	Linux Executable File
File extension RV	Real Video File
File extension RVDATA	RPG Maker VX Data File
File extension RVID	Snapz Pro X Recorded Video File
File extension RVL	Muvee Reveal X Project File
File extension RVPROJ	RPG Maker VX Project File
File extension RVT	Revit Project File
File extension RVX	Real Protected Video File
File extension RW2	Panasonic RAW Image
File extension RW3	RapidWeaver 3 Site File
File extension RWD	NRG Raw Wind Data File
File extension RWG	Random Word Generator Project File
File extension RWL	Leica RAW Image
File extension RWLIBRARY	Paperless Receipt Library
File extension RWP	RapidWeaver Package
File extension RWPLUGIN	RapidWeaver Plugin
File extension RWS	Borland C++ resource workshop symbol file
File extension RWSNIPPET	RapidWeaver Snippet File
File extension RWSTYLE	RapidWeaver Style File
File extension RWSW	RapidWeaver Site File
File extension RWTHEME	RapidWeaver Theme
File extension RWZ	Outlook Rules Wizard File
File extension RX2	REX2 Audio File
File extension RXC	Roxio Certificate File
File extension RXDATA	RMXP Data File
File extension RXE	Lego Mindstorms NXT Executable Program
File extension RZ	Rzip Compressed File
File extension RZB	Red Zion Book File
File extension RZK	File Crypt Password File
File extension RZN	Red Zion Notes File
File extension RZS	Red Zion Security File
File extension RZX	File Crypt Encrypted File