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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .H! | Perfect world Inc. | Database Files | Perfect Database Help Database File | Unknown Software | Unknown Developer |
| .HDB | HansaWorld | Database Files | HansaWorld Database File | HansaWorld Enterprise | HansaWorld |
| .HI2 | PHD Computer Consultants | Database Files | Spy-CD CD Search Database File | Spy-CD | PHD Computer Consultants |
| .HIS | Interscape | Database Files | FindinSite Database Definition File | PHDCC FindinSite-CD | Interscape |
| .HIW | PHD Computer Consultants | Database Files | Spy-CD CD Search Database File | Spy-CD | PHD Computer Consultants |
| .HIZ | PHD Computer Consultants | Database Files | Spy-CD CD Search Database File | Spy-CD | PHD Computer Consultants |
| .HK5 | Swiftpage, Inc. | Database Files | ACT! Database File | Act! | Swiftpage, Inc. |
| .HLD | Autodesk, Inc. | Database Files | Structural Desktop | Autodesk AutoCAD | Autodesk, Inc. |
| .HTRI | Heat Transfer Research, Inc. | Database Files | HTRI Xchanger Suite Data Input File | HTRI Xchanger Suite | Heat Transfer Research, Inc. |
| .HYD | MARIN | Database Files | MARIN Hydrodynamic Database File | Unknown Software | Unknown Developer |
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