| 1. | .al | Sound (Raw CCITT/ITU G.711 A-law format audio) |
| 2. | .alaw | Sound (Raw CCITT/ITU G.711 A-law format audio) |
| 3. | .alb | Graphics album (JASC Image Commander) |
| 4. | .alg | Activity Log (ARCSOLO) ◊ ER Mapper algorithm (ArcView) |
| 5. | .ali | Document file (SAP proprietary format) |
| 6. | .alias | Bitmap graphics (24bit RGB RLE) (Alias image file) |
| 7. | .all | Arts Letters Library (Symbol and font files) ◊ Filelist of all files (FRQView) ◊ Format file for working pages (Always) ◊ General printer information (WordPerfect) |
| 8. | .alo | Almanac support file |
| 9. | .alpha | Bitmap graphics (raw alpha bytes) |
| 10. | .als | Bitmap graphics (24bit RLE) (Alias Research, Vivid ray-tracer) |