| 11. | .gau | Gaussian Input format |
| 12. | .gb | Chinese text ◊ Emulator ROM image (Nintendo Gameboy) |
| 13. | .gbc | Color emulator ROM image file (Nintendo Gameboy) |
| 14. | .gbl | Global definitions (VAXTPU editor) ◊ Global module in Basic programs |
| 15. | .gc1 | Lisp language source code file (Golden Common Lisp 1.1) |
| 16. | .gc3 | Lisp language source code file (Golden Common Lisp 3.1) |
| 17. | .gcd | Generic CAD Drawing format (vector) |
| 18. | .gcp | Image processing file (Ground Control Point) |
| 19. | .gdb | Database file (InterBase) |
| 20. | .gdf | Dictionary file (Geoworks) |
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