| gzi | Gzip Compressed File |
| gzip | Gzip Compressed File |
| ha | HA Compressed Archive |
| haf | HEAT Archive |
| hap | Hamarsoft HAP Compressed Archive |
| haptar | Haptek Compressed Archive |
| hbc | SQL HyperBac Compressed Archive |
| hbc2 | SQL HyperBac Compressed Archive |
| hbe | SQL HyperBac Encrypted Archive |
| hbi | Handy Backup Index File |
| hcb | HyperOS Compressed Backup |
| hckx | Windows HCK Studio Submission Package |
| hif | Autodesk AutoCAD Heidi Information File |
| hki | WinHKI Archive |
| hki1 | WinHKI HKI1 Archive |
| hki2 | WinHKI HKI2 Archive |
| hki3 | WinHKI HKI3 Archive |
| hlkx | Windows HLK Studio Package |
| hpa | Hyper Patch Archive |
| hpk | HPack Compressed Archive |
| hqz | Internet Explorer for Mac HQZ Archive |
| htr | Haptek Compressed Archive |
| htz | Web ScrapBook Zipped Archive |
| hv3 | HoneyView 3 Archive |
| hyp | Hyper Compressed Archive |
| hzq | CrossWorks for ARM Package |
| iar | OpenSimulator Inventory Archive |
| ibf | Instant Backup Archive |
| icap | Adobe InCopy CS4 Package |
| ice | ICEOWS Archive |