| 1. | .rl1 | Regestered level file (Descent1) |
| 2. | .rl2 | Registered level file (Descent2) |
| 3. | .rl4 | Bitmap graphics |
| 4. | .rl8 | Bitmap graphics |
| 5. | .rla | Bitmap graphics (24bit true color Wavefront raster image file) |
| 6. | .rlb | Bitmap graphics (24bit true color Wavefront raster image file) ◊ Data (Harvard Graphics Win) |
| 7. | .rlc | Bitmap graphics (Run Length Coded RLC file) ◊ CAD Overlay |
| 8. | .rld | Temporary file (Norton Commander 5.0) |
| 9. | .rle | Bitmap graphics (Utah Run-Length Encoded image file) ◊ Bitmap graphics - 4bit or 8bit ADEX file (ADEX Corporation ChromaGraph series of graphics cards) |
| 10. | .rlz | Realizer source code file (CA-Realizer) |
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