| h5b | SuperHeat 5 Building Data |
| h5e | Line 6 POD HD500 Edit Preset Data |
| h5s | Line 6 POD HD500 Edit Setlist Data |
| h6h | JUKI HLC Script |
| h6x | Soft6502 Trainer/Simulator Hex Data |
| h77t | GEODAS MGD77T Header Data |
| h86 | CP/M Data |
| WOW! Diagnostic Firmware Module |
| haas | Everfine HAAS Test Results Data |
| hab | HelpMaker Backup Data |
| had | Haydee Web Server Module Style |
| hal | HotDocs Answer Library |
| HyperAccess Lite for OS/2 Data |
| halog | IEInspector HTTP Analyzer Log |
| hamachi | Hamachi Client Data |
| har | E-Sword Harmony Resource |
| HTTP Archive |
| harx | E-Sword v9.1 Harmony Resource |
| hash | EnCase Forensics Hash File |
| hashdb | HashDB Database |
| hat | HOORA Analysis Tool Model Data |
| hb | Harwell Boeing Sparse Matrix |
| HotBasic Data |
| hb2 | HBPLUS Output Data |
| hbb | Line 6 POD HD Edit Bundle |
| hbc | Homebanking Computer Interface |
| hbci | Homebanking Computer Interface |
| hbd | HardlinkBackup Backup Definition |
| hbe | Line 6 POD HD Edit Preset |
| hbin | HITRAN Binary Output |
| hbk | HandyCafe Data |
| Hex Workshop Bookmark File |
| netCDF ANDI Chromatography Data |
| Synology DiskStation Manager Hyper Backup |
| hbn | Java Hibernate Data |
| hbp | CLIC RAW Header Data |
| HBPredicT Output |
| hbs | Line 6 POD HD Edit Set List |
| hbx | BinHex 2.0 Encoded Data |
| HAHTsite HAHTtalk Widgets Data |
| hc3 | AquaChem v3 Database |
| hca | Hammer Call Analyzer Network Traffic Data |
| hcc | HydroCAD Prefab Chamber |
| hcd | ICM Hourly Climatic Database |
| hce | HydroCAD Hydrograph File |
| hcfg | HoDoKu Configuration |
| hcg | HCLab Document |
| hch | General CADD Hatch |
| hci | HydroCAD IDF Curve |
| hcj | Hashcat Job Data |
| hck | MGS Hinge CK File |
| hcl | HotDocs Clause Archive |
| hclassic | Houdini 11 ASCII Geometry Data |
| hcn | X90-OPUS Occupation Data |
| hco | IBM HATS Connection Data |
| hcode | Mastercam HASP Code |
| hcr | HydroCAD Rainfall Curve Data |
| hcs | eSubmission Builder Package |
| hcss | Hyper Color Swatch Set |
| hct | Symantec LiveUpdate HCT Data |
| hcu | HydroCAD Units Definition |
| hcw | HTML Help Workshop Conversion Wizard Macro |
| hcx | BinHex 2.0 Encoded Data |
| Harvard ChartXL Chart Data |
| hcxs | Health Canada Form Data |
| hd2 | Poser Hand Data |
| hd3 | Huidu LED Matrix Data |
| hda | HotDocs Auto-Assemble File |
| Houdini Digital Asset Library |
| hdalc | Houdini Indie Digital Asset Library |
| hdanc | Houdini Non-commercial Digital Asset Library |
| hdat | Objective Analysis HDAT Data |
| vStaticIP Internal Data |
| hdb | Act! History Data |
| HansaWorld Database File |
| Maple Help Database |
| Watcher Database Data |
| hdc | Autodesk Land Desktop Hydrograph Data |
| HD Tach Benchmark Data |
| HelloDOC Medical Data |
