| 1. | .hp | Primary hash file (THOR database) ◊ Printout file for HP printers/plotters (HP/GL) |
| 2. | .hp8 | Text in HP Roman8 character set (NewWave Write) |
| 3. | .hpc | Font language file (Hewlett-Packard) |
| 4. | .hpf | HP LaserJet fonts (PageMaker) ◊ High Performance Fortran source code file ◊ Partial download file (HotLine) |
| 5. | .hpg | Vector graphics for plotter (Hewlett-Packard Graphics Language) |
| 6. | .hpgl | Vector graphics for plotter (Hewlett-Packard Graphics Language) |
| 7. | .hpi | Font information (GEM) |
| 8. | .hpj | Help project (Microsoft Help Compiler) ◊ Printed to file (HP LaserJet) |
| 9. | .hpk | Compressed file archive (HPack) |
| 10. | .hpl | Vector graphics (Hewlett-Packerd LasetJet) |
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