| Abbreviation | Definition |
|---|---|
| HPK | Compressed file archive (HPack) |
| HPL | Hewlett-Packerd LaserJet Vector graphics file |
| HPLJ | Vector graphics (Hewlett-Packerd LasetJet) |
| HPM | High Performance Map ( Quaestor 1.x) |
| HPM | HP NewWave EMM text file |
| HPM | Procomm Plus Alternate Main menu for privileged users |
| HPP | C++ header (Zortech C++ - Watcom C/C++) |
| HPP | Vector graphics (Hewlett-Packard Printer Control Language) |
| HPPCL | Vector graphics (Hewlett-Packard Printer Control Language) |
| HQX | Encoded Macintosh archive (ASCII) (BinHex) |
| HRF | Bitmap graphics (Hitachi Raster Format) (CADCore) |
| HRH | Common header for resources and C++ |
| HRM | Alternate Main menu for limited/normal users (Procomm Plus) |
| HRZ | SSTV Graphics file |
| HS | Literate Haskell source code file |
| HS2 | Monochrome image (Postering) |
| HSC | HSC tracker 2-op FM music file |
| HSF | Hypnotizer Streaming Format |
| HSI | Handmade Software Inc. Bitmap graphics file |
| HSP | HomeSite WWW Page project file |