| Abbreviation | Definition |
|---|---|
| RES | XBoard Resign conferences file |
| REV | Revision file (Geoworks) |
| REX | Oracle Report definition |
| REX | PharLab Executable file (old format) |
| REX | Rexx language source code file |
| REZ | Resource file |
| RF | Bitmap graphics - Raster File |
| RFM | Rich music format |
| RFT | Revisable Format Text file ( IBM DisplayWrite 4.0-5.1) |
| RG | 1bit B&W 4bit CMYK Raster Graphics format |
| RGB | Raw 24bit Red- Green- Blue Bitmap graphics |
| RGX | ReaGeniX code generator Symbol tables, etc., info |
| RH | Borland C++ or Visual C++ Resource header file |
| RH | Resource header (Borland C++, Visual C++) |
| RI | Lotus 1-2-3 Data |
| RIB | Renderman Interface Bytestream Graphics (3D Reality) |
| RIC | Ricoh Fax format |
| RIF | Resource Interchange File Format Bitmap graphics |
| RIFF | Resource Interchange File Format bitmap graphics |
| RIP | Maximus 3.0 Telegrafx Remote Imaging Protocol |