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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .HTW | Microsoft Corporation | Data Files | IIS Webhits Template | Microsoft IIS | Microsoft Corporation |
| .HUE | HUE | Data Files | HUE Animation Project | HUE Animation | HUE |
| .HUF | David A. Huffman | Data Files | Huffman Encoded Data | Unknown Software | Unknown Developer |
| .HUH | HydroCAD Software Solutions | Data Files | HydroCAD Unit Hydrograph Definitions File | HydroCAD | HydroCAD Software Solutions |
| .HUN | Interscape | Data Files | Personal Paint Hungarian Language User Interface | Personal Paint | Amiga |
| .HVUF | Unknown Developer | Data Files | Hydraulic Calculation Format | Unknown Software | Unknown Developer |
| .HW | CLO Virtual Fashion Inc. | Data Files | Marvelous Designer Hardware ID Data | Marvelous Designer | CLO Virtual Fashion Inc. |
| .HW3 | SoftBIt | Data Files | World Literary Heritage Document File | World Literary Heritage | SoftBIt |
| .HWF | Hantek | Data Files | Hantek HDG2000B Wave Format Data | HDG2002B | Hantek |
| .HWL | Corel | Data Files | Corel Writing Tools File | Corel WordPerfect X8 | Corel |
| .HWOF | Microsoft Corporation | Data Files | Microsoft Office For Mac Help File | Microsoft Office | Microsoft Corporation |
| .HWPML | Hancom, Inc. | Data Files | Hangul Word Processor Markup Language Document | Hangul | Hancom, Inc. |
| .HWV | Open Source | Data Files | Hades Waveform Viewer Data | Hades simulation framework | Open Source |
| .HWX | Rockwell Automation Inc. | Data Files | RSNetWorx Registration Data | RSNetWorx | Rockwell Automation Inc. |
| .HXD | Microsoft Corporation | Data Files | Microsoft Help Validator Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HXE | Microsoft Corporation | Data Files | Microsoft Windows Help Samples Definition File | Microsoft Windows Help | Microsoft Corporation |
| .HXF | Microsoft Corporation | Data Files | Microsoft Help 2 Project Include File | Microsoft Windows | Microsoft Corporation |
| .HXL | Microsoft Corporation | Data Files | Microsoft Help Registered Namespace List File | Microsoft Windows Help | Microsoft Corporation |
| .HXQ | Microsoft Corporation | Data Files | Microsoft Help 2 Query Index | Microsoft Visual Studio | Microsoft Corporation |
| .HXR | Microsoft Corporation | Data Files | Microsoft Help Data File | Microsoft Visual Studio | Microsoft Corporation |
| .HXT | Microsoft Corporation | Data Files | Microsoft Help 2 Table Of Contents File | Microsoft Windows | Microsoft Corporation |
| .HY1 | Corel | Data Files | Ventura Publisher Hyphenation Algorithm File | Ventura Publisher | Corel |
| .HY2 | Corel | Data Files | Ventura Publisher Hyphenation Algorithm File | Ventura Publisher | Corel |
| .HYC | Corel | Data Files | Corel WordPerfect Hyphenation Data File | Corel WordPerfect | Corel |
| .HYD | MARIN | Data Files | MARIN Hydrodynamic Database File | Unknown Software | Unknown Developer |
| .HYP | Interscape | Data Files | HYPER Compressed Archive | Hyper | Interscape |
| .HZF | Home Inspection Software | Data Files | Client Inspection File | Home Inspector Pro | Home Inspection Software |
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