| H | C/C++/Objective-C Header File | Developer Files | 12 | 2 |
| H! | Perfect Database Help Database File | Database Files | 1 | 1 |
| H0 | Movie Edit Pro Waveform Information File | Audio Files | 1 | 1 |
| H1 | Unknown File Type | Uncommon Files | 1 | 1 |
| H11 | At Home Canada 2011 Tax Return | Data Files | 2 | 1 |
| H12 | At Home Canada 2012 Tax Return |
Data Files
| 2 | 1 |
| H13 | H&R Block Canada 2013 Tax Return |
Data Files
| 2 | 1 |
| H14 | H&R Block Canada 2014 Tax Return |
Data Files
| 2 | 1 |
| H15 | H&R Block Canada 2015 Tax Return |
Data Files
| 2 | 1 |
| H16 | H&R Block Canada 2016 Tax Return |
Data Files
| 2 | 1 |
| H17 | H&R Block Canada 2017 Tax Return |
Data Files
| 1 | 1 |
| H19 | An Unknown Apple II File |
Uncommon Files
| 1 | 1 |
| H1Q | Microsoft Help Merged Query Index |
Uncommon Files
| 1 | 1 |
| H1S | Windows Assistance Platform Help File | System Files | 3 | 1 |
| H264 | H.264 Encoded Video File | Video Files | 7 | 1 |
| H2O | Battle Realms Game Data File | Game Files | 4 | 2 |
| H2W | H2testw File |
Data Files
| 1 | 1 |
| H3M | Heroes 3 Map File |
Game Files
| 1 | 1 |
| H3R | Panasonic Video Camera File |
Video Files
| 1 | 1 |
| H4C | Heroes Of Might And Magic II Map File |
Game Files
| 1 | 1 |
| H4R | Heroes Of Might And Magic IV Data File |
Game Files
| 1 | 1 |
| H5 | Hierarchical Data Format 5 File |
Data Files
| 4 | 1 |
| H64 | Audioless H.264 Video File |
Video Files
| 1 | 1 |
| HA | HA Compressed Archive | Compressed Files | 4 | 1 |
| HAC | Helma Actions Script |
Developer Files
| 1 | 1 |
| HAI | Ntgraph Nt09b-2b Emx Lib File |
Uncommon Files
| 1 | 1 |
| HAK | BioWare Aurora Engine Data File |
Game Files
| 1 | 1 |
| HAL | HansaWorld Enterprise HAL Code File |
Uncommon Files
| 3 | 3 |
| HAM | Descent 2 Resource File |
Game Files
| 3 | 3 |
| HAML | HTML Abstraction Markup Language File |
Developer Files
| 4 | 1 |
| HAN | Amazon Kindle eBook Data File | eBook Files | 3 | 1 |
| HAP | HAP Compressed File Archive |
Compressed Files
| 1 | 1 |
| HAR | E-Sword Harmony Resource File |
Data Files
| 2 | 2 |
| HARP | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| HASH | EnCase Forensic Drive Image Hash |
Data Files
| 1 | 1 |
| HAT | Duck Game Hat File |
Game Files
| 3 | 3 |
| HAV | Video Recorder Video Data |
Uncommon Files
| 1 | 1 |
| HAY | Haydee Web Server Module Content File |
Developer Files
| 1 | 1 |
| HAZ | Microsoft Flight Simulator Texture File |
Data Files
| 1 | 1 |
| HBB | Line 6 POD HD Edit Bundle |
Audio Files
| 1 | 1 |
| HBC | HyperBac Compressed Archive |
Compressed Files
| 2 | 1 |
| HBC2 | HyperBac Compressed File Archive |
Compressed Files
| 1 | 1 |
| HBE | HyperBac Compressed Archive |
Compressed Files
| 2 | 1 |
| HBI | Handy Backup Backup File | Backup Files | 1 | 1 |
| HBK | Mathcad Handbook File | Text Files | 1 | 1 |
| HBQ | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| HBS | Handlebars Template |
Developer Files
| 2 | 1 |
| HBX | BinHex Encoded File | Encoded Files | 3 | 2 |
| HC | VeraCrypt Container File | Disk Image Files | 2 | 2 |
| HCA | Hammer Call Analyzer Network Traffic Data |
Data Files
| 2 | 2 |
| HCC | HydroCAD Prefab Chamber Data File |
Data Files
| 2 | 1 |
| HCD | Samsung Android Firmware File |
System Files
| 1 | 1 |
| HCE | HydroCAD Hydrograph Data |
Data Files
| 1 | 1 |
| HCF | Compact Ham Library |
Developer Files
| 2 | 2 |
| HCG | HClab Chart File | Graphic Files | 1 | 1 |
| HCI | HydroCAD IDF Data |
Data Files
| 1 | 1 |
| HCL | HotDocs Clause Archive |
Data Files
| 1 | 1 |
| HCM | IBM HCM Configuration File | Settings Files | 1 | 1 |
| HCO | Macintosh Sound Resource Fork File |
Audio Files
| 1 | 1 |
| HCP | HydroCAD Project File | CAD Files | 1 | 1 |
| HCR | Half-Fold Card File | Page Layout Files | 4 | 2 |
| HCT | Symantec LiveUpdate Data |
Data Files
| 1 | 1 |
| HCU | Hydrograph Units Definitons File |
Data Files
| 2 | 1 |
| HCW | HTML Help Workshop Conversion Wizard Macro File |
Data Files
| 1 | 1 |
| HCX | Harvard ChartXL Chart |
Data Files
| 1 | 1 |
| HD | VistaCodecs Data |
Data Files
| 1 | 1 |
| HD2 | Poser Hand Pose File | 3D Image Files | 1 | 1 |
| HDA | HotDocs Auto-Assemble File |
Data Files
| 1 | 1 |
| HDB | HansaWorld Database File |
Database Files
| 3 | 3 |
| HDC | HD Tach Benchmark Results |
Data Files
| 2 | 2 |
| HDD | Parallels Desktop Hard Disk File |
Disk Image Files
| 2 | 2 |
| HDI | Hard Disk Image |
Disk Image Files
| 4 | 3 |
| HDK | HotDocs Registration File |
Uncommon Files
| 1 | 1 |
| HDL | HotDocs Library File |
Data Files
| 2 | 2 |
| HDM | Handheld Device Markup Language (HDML) File | Web Files | 8 | 1 |
| HDML | Handheld Device Markup Language (HDML) File |
Web Files
| 8 | 1 |
| HDMOV | QuickTime HD Movie File |
Video Files
| 3 | 1 |
| HDMP | Windows Heap Dump |
System Files
| 1 | 1 |
| HDP | HD Photo File | Raster Image Files | 8 | 3 |
| HDR | High Dynamic Range Image File |
Raster Image Files
| 2 | 2 |
| HDRU | Apollo HRDU Image Format |
3D Image Files
| 1 | 1 |
| HDS | Parallels Desktop Hard Disk File |
Disk Image Files
| 3 | 3 |
| HDT | Photoshop HDR Toning Preset File |
Settings Files
| 7 | 4 |
| HDV | High Definition Video Format |
Video Files
| 2 | 2 |
| HDW | Harvard Graphics Graphic File |
Graphic Files
| 1 | 1 |
| HDX | Delphi MultiHelp Index File |
Uncommon Files
| 1 | 1 |
| HDXI | HedEx Lite File |
Uncommon Files
| 1 | 1 |
| HE | Humongous Entertainment Game Resource Archive |
Game Files
| 1 | 1 |
| HE0 | Humongous Entertainment Game Archive |
Game Files
| 1 | 1 |
| HE5 | Hierarchical Data Format Release 5 |
Data Files
| 1 | 1 |
| HEA | FIFA 2001 Data File |
Game Files
| 1 | 1 |
| HEAD | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| HEADER | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| HEB | DEcomp 3D Scene Data |
3D Image Files
| 1 | 1 |
| HEC | Grafic Pvquan Quant File |
Data Files
| 1 | 1 |
| HED | Hi-Eddi Image File |
Graphic Files
| 1 | 1 |
| HEIC | High Efficiency Image Format |
Raster Image Files
| 5 | 1 |
| HEIF | High Efficiency Image Format |
Raster Image Files
| 5 | 1 |
| HELP | Mac OS X Help Book |
System Files
| 1 | 1 |
| HELPCFG | Adobe AIR Help Configuration |
Settings Files
| 1 | 1 |
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