| hfp | Harrys Filters Preset |
| hid | Sony Ericsson Bluetooth HID Configuration |
| hkc | HTML-Kit Auto Complete Shortcuts Data |
| hml | HostMonitor TestList Data |
| hnh | HTTP Net Header Configuration |
| hotkeys | 3D-Coat Hotkeys Settings Data |
| hrt | Heart-Profit Configuration |
| ht | HyperTerminal Settings |
| htaccess | Apache htaccess File |
| htgroup | Apache htgroup File |
| hvm | Xen HVM Configuration File |
| hvpn | HSS Elite VPN Configuration |
| hwdef | Linux Kernel Hardware Description |
| iaf | Microsoft Outlook Internet Account Settings |
| ick | IntelliCAD Custom Keyboard File |
| icst | Adobe InCopy Document Settings File |
| icte | Mac OS X Internet Configuration Data |
| idc | Internet Database Connector |
| iddx | Adobe InDesign Static Defaults File |
| idg | Majax Configuration |
| idi | DB/TextWorks Last-used Settings |
| idp | IBM PComm Interchange Document Profile |
| idq | Internet Data Query File |
| iea | Image Eye Adjustment Data |
| iem | Internet Explorer Maintenance Extension |
| ifb | Siebel EIM Interface Configuration |
| igg | SuiteProfiler Color Map |
| igpi | Intel HD Graphics Profile |
| iip | ThinAnywhere Configuration |
| ikf | INTUS Terminal Keyboard Settings |
| ikmp | IK Sampletank Module Presets |
| ilc | Xpert.ivy Launch Control File |
| imo | iMON Manager Configuration |
| ini | Initialization File |
| ini-dist | PHP Distribution Default Settings Data |