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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .H264 | Ulead Systems | Video Files | H.264 Encoded Video File | Corel VideoStudio Pro | Corel |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Corel WordPerfect | Corel |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Corel WordPerfect | Corel |
| .HP | Hewlett-Packard | Vector Image Files | HP Graphics Language Plotter File | CorelDRAW Graphics Suite | Corel |
| .HPGL | Hewlett-Packard | Vector Image Files | HP Graphics Language Plotter File | CorelDRAW Graphics Suite | Corel |
| .HPL | Hewlett-Packard | Vector Image Files | HP Graphics Language Plotter File | CorelDRAW Graphics Suite | Corel |
| .HPW | Hewlett-Packard | Text Files | Hewlett-Packard Word Document File | Corel WordPerfect | Corel |
| .HST | Yahoo! | Data Files | History File | Corel WordPerfect | Corel |
| .HTN | Corel | Data Files | Micrografx Picture Publisher File | Micrografx Picture Publisher | Corel |
| .HWL | Corel | Data Files | Corel Writing Tools File | Corel WordPerfect X8 | Corel |
| .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 | Database Files | MARIN Hydrodynamic Database File | Corel WordPerfect | Corel |
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