| hqp | CP/M Disk Utility Data |
| hqv | HQ Pro-Stitcher Vector Data |
| hqx | Macintosh BinHex Encoded File |
| hr2 | Poser Hair Data |
| hr5 | Heredis 2000 Family History Data |
| hrb | TIBCO Hawk Rulebase Data |
| hrc | AQUA Hydrogen Bond Distance Restraints Counts Data |
| Softimage 3D Model |
| hrd | MSC Patran Device-dependent Hardcopy Output File |
| hrf | HyperRipper Data |
| hrm | Netmino HRM Data |
| Polar Heart Rate Monitor Data |
| Procomm Plus Alternate Menu |
| hrp | AviSys Bird Watcher Database |
| HAHTsite Referred Project Information |
| hrr | WRAP Hydropower and Reservoir Release Data |
| hrs | HRS Pro NAUPA II File |
| hru | SWAT HRU Data |
| hrv | AQUA Hydrogen Bond Distance Restraints Violations Data |
| HRVTool Data |
| hrz | Poser Compressed Hair Data |
| hs | Hyperstudio Stack Data |
| JavaHelp HelpSet Data |
| hs2 | HyperRESEARCH 2 Study |
| hs3 | HyperRESEARCH 3 Study |
| hs6lic | HyperSnap License Data |
| hs7lic | HyperSnap License Data |
| hs8lic | HyperSnap 8 License Data |
| hsa | Hagaki Studio Address Book |
| hsancillary | Mac OS X Finder Data |
| hsc | Aspen HYSYS Simulation |
| IBM HATS Screen Capture Data |
| hscx | HemoSpat Coordinate Exchange Format Data |
| hse | Adobe Dreamweaver Snippet Data |
| hsf | Lizard Protector Web Content Security Protected Content |
| hsh | Microsoft IIS Metabase Hash File |
| Microsoft Surface Calibration Hash |
| Microsoft Windows Catalog Search Index Hash |
| hsk | Nimbus 7 SAMS HSK Data |
| hskat | Knowledge Master Data |
| hsl | Hex Workshop Structure Library |
| hsm | AQUA Hydrogen Bond Distance Restraints Summary Data |
| hsn | HostScan Hosts Data |
| hsol | HoDoKu Sudoku Data |
| hsp | iGO Primo Histspeed File |
| hsql | SAS/IntrNet htmSQL Data |
| hsr | RezeptAssist Exported Data |
| hss | Adobe Photoshop Hue/Saturation Data |
| hst | 3DCS Analysis Histogram Data |
| Corel WordPerfect Office History Data |
| General History File |
| Netscape Navigator History Data |
| Yahoo! Messenger History Data |
| hstx | Altair HyperStudy Package |
| hsw | STEPS Frequency Response Data |
| hsz | Handyscript Skin |
| ht1 | Google Desktop HT1 File |
| hta | S10 WebAlbums Data |
| htb | Audacity Help File |
| hte | HealthStream Express Exported Test Data |
| htf | Hydrographic Transfer Format Data |
| htheme | Thinkfree Office NEO Show Theme |
| hti | MXKEY HTI Data |
| htk | HTK Format Parameter File |
| htmenx | Egis Encrypted HTML Data |
| htmsql | SAS/IntrNet htmSQL Data |
| htn | Micrografx Picture Publisher 8 Print Style Data |
| hto | Survex Hierarchical Tagged Objects File |
| htp | Autodesk AutoCAD Civil 3D Slope Template Definition |
| htpasswd | Apache Password File |
| htpl | IBM Rational Application Developer WebContent Theme |
| htr | Motion Analysis Skeletal Data |
| htrc | HTRC Workset Toolkit Configuration Data |
| htri | HTRI Xchanger Suite Data Input |
| hts | HyperTuner Skin |
| MetaTrader Historical Data |
| Steam Client Saved Game Data |
| htv | HTV Teletekst Data |
| htw | Webhits Template |
| htx | Microsoft Frontpage Database Results Data |
