| .H! | Perfect world Inc. | Fichiers de base de données | Perfect Database Help Database File | Unknown Software | Unknown Developer |
| .H1 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HAI | Unknown Developer | Fichiers divers | Ntgraph Nt09b-2b Emx Lib File | Unknown Software | Unknown Developer |
| .HARP | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HBQ | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HEAD | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HEADER | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HEB | Unknown Developer | Fichiers 3D | DEcomp 3D Scene Data | DEcomp | Unknown Developer |
| .HEC | Unknown Developer | Fichiers de données | Grafic Pvquan Quant File | Unknown Software | Unknown Developer |
| .HED | XnSoft | Fichiers graphiques | Hi-Eddi Image File | Unknown Software | Unknown Developer |
| .HELPER | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HER | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HEY | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HFI | Hewlett-Packard | Fichiers de police d’écriture | HP Font | Unknown Software | Unknown Developer |
| .HFX | Smith Micro Software | Fichiers de données | HotFax Data File | Unknown Software | Unknown Developer |
| .HGC | Unknown Developer | Fichiers de données | PC Fold Data | PC Fold | Unknown Developer |
| .HIGH | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HJD | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HLF | Eugene Roshal | Fichiers de données | FAR Manager Help Data | Hires Interlaced | Unknown Developer |
| .HLG | BMERC | Fichiers de données | BMERC Homolog File Format | Unknown Software | Unknown Developer |
| .HLT | Unknown Developer | Fichiers de données | Watcher Database Trades List File | Watcher Database | Unknown Developer |
| .HLW | Unknown Developer | Fichiers de données | Win32/AMalum.EDHZ Data | Unknown Software | Unknown Developer |
| .HM4 | Lorex Technology | Fichiers de sauvegarde | Lorex Backup File | Unknown Software | Unknown Developer |
| .HNB | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HNL | Unknown Developer | Fichiers de données | Hunter MFC Data | Unknown Software | Unknown Developer |
| .HNM | Cryo Interactive Entertainment | Fichiers vidéo | Cryo HNM Movie Soundtrack | Unknown Software | Unknown Developer |
| .HNQ | Unknown Developer | Fichiers divers | Hunter File | Unknown Software | Unknown Developer |
| .HNT | Unknown Developer | Fichiers divers | Hunter CSV Based Collections | Unknown Software | Unknown Developer |
| .HNY | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HOF | Unknown Developer | Fichiers de jeu | Hall Of Fame Data | Unknown Software | Unknown Developer |
| .HONMOD | S2 Games | Fichiers de jeu | Heroes Of Newerth (HON) Modification Manager File | HON Modification Manager | Unknown Developer |
| .HOR | Unknown Developer | Fichiers de données | Horoscope Data | Winhoro | Unknown Developer |
| .HOX | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HP5 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HP?= | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HPDATA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HPF | IBM | Fichiers de développeurs | High Performance Fortran File | Fortran 90 With The pghpf Extension | Unknown Developer |
| .HPH | Unknown Developer | Fichiers divers | Designer Graphics System 2 Data File | Designer Graphics System 2 | Unknown Developer |
| .HPI | Hemera Technologies | Fichiers Raster Image | Hemera Photo Objects Image File | HEMERA software | Unknown Developer |
| .HPRT | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .HQB | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HQM | Unknown Developer | Fichiers de jeu | Hardcore Questing Mode Data File | Hardcore Questing Mode | Unknown Developer |
| .HR | Atari Corporation | Fichiers graphiques | Atari Picture Image File | Unknown Software | Unknown Developer |
| .HRYX | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HSM | Unknown Developer | Fichiers de développeurs | Assembly Language Header File | Assembly Programming Language | Unknown Developer |
| .HUA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HUF | David A. Huffman | Fichiers de données | Huffman Encoded Data | Unknown Software | Unknown Developer |
| .HVL | Unknown Developer | Fichiers audio | Commodore Amiga HivelyTracker Audio Module | Hively Tracker | Unknown Developer |
| .HVT | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HVUF | Unknown Developer | Fichiers de données | Hydraulic Calculation Format | Unknown Software | Unknown Developer |
| .HWA | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HWK | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HX_ | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HYB | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .HYD | MARIN | Fichiers de base de données | MARIN Hydrodynamic Database File | Unknown Software | Unknown Developer |
| .HYL | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .HZ | Unknown Developer | Fichiers textes | Chinese (Hanzi) Text | Unknown Software | Unknown Developer |
| .HZB | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
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