| Abbreviation | Definition |
|---|---|
| QXP | QuarkXPress |
| QXP | SanScrip QuickCreateXP Course Customizer |
| QXT | Quark XPress Template |
| QZD | Quiz Description |
| R | RATFOR (short for Rational Fortran) file |
| R2D | Reflex 2 Data file |
| R8 | Raw graphics (one byte per pixel) plane one (PicLab) |
| R8 | Red channel image data (24bit 3D animation) (Cubicomp PictureMaker) |
| R8P | Intellifont PCL 4 bitmap font file |
| RA | RealAudio Audio file |
| RA | Remote Access Data file |
| RAA | Ruby Application Archive |
| RAD | Radience |
| RAD | Reality AdLib Tracker 2-op FM music file |
| RAM | RealAudio Metafile |
| RAR | RAR Compressed file archive |
| RAR | Russian ARchiver |
| RAS | Sun RASter image Bitmap graphics |
| RAST | Bitmap graphics (Sun raster image) |
| RAST | Sun raster image Bitmap graphics file |