| 21. | .hds | Hierarchical Data System |
| 22. | .hdw | Vector graphics (Harvard Draw) |
| 23. | .hdx | Help index (AutoCAD - Zortech C++) |
| 24. | .hed | Document (HighEdit) |
| 25. | .hel | Saved game (Microsoft Hellbender) |
| 26. | .hep | Novell Help Librarian Data File (Novell NetWare) |
| 27. | .hex | Encoded file archive (ascii) (Macintosh BinHex) ◊ Hex dump |
| 28. | .hfi | HP Font Info file (GEM) |
| 29. | .hfx | Data file (US Robotics Rapid Comm Voice) ◊ Drawing (Harvard F/X) |
| 30. | .hgl | Highlight groups definitions (DN) ◊ Vector graphics for plotter (Hewlett-Packard Graphics Language) |
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