R
Ratfor file (FORTRAN Preprocessor)
R
Resource file (Pegasus Mail)
RA
Sound file (RealAudio)
RAM
Metafile (RealAudio)
RAO
ReadAllOver (YOUniverse)
RAR
RAR compressed archive (Eugene Roshall's format)
RAS
Bitmap (Sun Raster Images)
RAT
Datafile (RATS)
RAW
Raw File Format (bitmap)
RAW
Raw signed PCM data
RAW
Raw signed PCM data
RBF
Datafile (Rbase)
RBH
Maintained by RoboHELP, the RBH file adds to the information contained in the Help project
file
RC
Resource script (Micosoft C/C++)
RC
Resource script (Borland C++)
RC
Configuration file (emacs)
RCG
Newsgroup file (Netscape)
RD1
Registered level file (Descent1)
RDF
Resource Description Framework file (related to XML and metadata)
RDF
Compiled UIC source code (Geoworks UI Compiler)
RDF
Research document information format
RDI
Device-independent bitmap file
RDL
Registered Level file (Descent)
RDX
Datafile (Reflex)
REC
Datafile (EpiInfo)
REC
Recorded macro (Microsoft Windows 3.x)
REC
Voice file (RapidComm)
REC
Record file (Sprint)
RED
Path information file (Clarion Modula-2)
REF
Reference file (Generic)
REG
Registration file
REG
Registration file (Corel)
REG
OLE registration file (Microsoft Windows 3.x)
REM
Remarks file (Generic)
REP
Reply file (QWK Reader)
REP
Report file (Visual dBase)
REP
Report file (Report Designer)
REP
Report file (DataBoss)
REP
Report file (CodeReporter)
REQ
Request file (Generic)
RES
Resource file (Microsoft Visual C++)
RES
Compiled resource file (Borland C++)
RES
Resource file (dBase IV)
REV
Revision file (GeoWorks)
REX
Source code file (REXX)
REX
Report definition (Oracle)
REZ
Resource file (Generic)
RF
Raster graphics file (Sun)
RFT
Revisable Form Text (part of IBM's DCA or Document Content Architecture)
RGB, SGI
RGB files (Silicon Graphics)
RGX
Symbol tables (ReaGeniX code generator)
RH
Resource header file (Borland C++ 4.5)
RI
Data file (Lotus 1-2-3)
RIB
Graphics in Renderman format (3DReality)
RIC
Fax document (Ricoh)
RIF
RIFF bitmap graphics (Fractal Design Painter)
RIF
Image file (Metacreations Painter)
RIP
Graphics (remote access)
RIX
Bitmap graphics (ColorRIX VGA Paint)
RL1
Regestered level file (Descent1)
RL2
Registered level file (Descent2)
RL4
Bitmap graphics file
RL8
Bitmap graphics file
RLA
Wavefront raster image (SDSC Image Tool)
RLB
Data file (Harvard Graphics Win 9.x)
RLC
Graphics file (1 bit per pixel scanner output file)
RLE
Run-Length Encoded bitmap (SDSC Image Tool)
RLZ
Realizer source code file (CA-Realizer)
RM
Video file (RealAudio)
RMD
Document (Microsoft RegMaid)
RMF
Rich Map Format (used by 3-D game editors to store a map)
RMF
Rich music format (Beatnik)
RMI
MIDI music
RMK
Makefile (Clipper RMake)
RN
Xpl Program file (Nota Bene)
RND
Rendering slide (AutoCAD-AutoShade)
RNO
Runoff file (VAX)
ROL
FM music Adlib Music file (Roland)
ROM
Cartridge-based home video game emulator file (exact copy of ROM contents in cartridges
from Atari 2600, Colecovision, Sega, Nintendo, etc.; not interchangeable between emulators)
ROV
Data file (Rescue Rover)
RPD
Database (RapidFire)
RPL
Text document (Replica)
RPM
Package Manager (RedHat Linux)
RPT
Crystal Reports file ( and a sub-set of Microsoft Visual Basic)
RRS
Saved game file (Ace Road Rash)
RS
Datafile (Amiga Resource Reassembler)
RSB
Red Storm bitmap (Rainbow 6 (Game) and several image editing programs)
RSC
Resource file (Generic)
RSL
Paradox 7 reports (Broderland)
RSM
Resume file (WinWay Resume Writer)
RSP
Response file (Generic)
RS_
Resourse fork file (Macintosh Mac-ette)
RTF
Rich Text Format document
RTF
Help file script (Microsoft Windows 9.x)
RTL
Run Time library (NU 7.0)
RTM
Music module (MOD) (Real Tracker)
RTK
Used by RoboHELP to simulate the search feature of Windows help
RTL
Text file (Generic)
RTP
Software update package data file (RTpatch)
RTS
RTSL document (RealAudio)
RTS
Runtime library file (CA-Realizer)
RTS
RoboHELP to speed complex operations
RUL
Extension used in InstallShield
RVP
Scan Configuration file (MIME) (Microsoft)
RVW
Review file (Generic)
RWS
Resource Workshop data file (Borland C++)
RWX
Script file (RenderWare)
RXX
RAR compressed files from a multi-volume archive (xx = a number from 01 to 99)
R8
Raw graphics (One byte per pixel) plane one (PicLab)
R8P
Pcl 4 bitmap font (Intellifont)