| H | Developer | 9797 | if_shaper.h |
| H1C | Windows Help | 4 | Windows.h1c |
| H1D | Windows Help | 4 | Help_MValidator.H1D |
| H1H | Windows Help | 2 | Help_MTOC_help.H1H |
| H1K | Windows Help | 16 | Help_BestBet.H1K |
| H1S | Windows Help | 239 | artcon.h1s |
| H1T | Windows Help | 4 | Help.H1T |
| H1W | Windows Help | 6 | Help_MKWD_BestBet.H1W |
| H264 | Video | 3 | broadcastpause720.h264 |
| HASH | | 8 | SolidFramework.native.hash |
| HCP | CAD | 65 | StartTile.hcp |
| HDR | Raster Image | 117 | studio_02.hdr |
| HEQ | Data | 1 | M1033Eva.HEQ |
| HEX | Encoded | 4 | usbdload.hex |
| HHK | System | 20 | scoped_4.hhk |
| HIT | Game | 5 | ResCache.hit |
| HKF | Data | 5 | NETFXSBS10.hkf |
| HLP | Windows Help | 374 | EDIT.HLP |
| HLX | Data | 32 | ScandinavianEntityNames.hlx |
| HOL | Data | 13 | OUTLOOK.HOL |
| HPI | Raster Image | 2 | HPEACLHN.HPI |
| HTC | Internet Web | 24 | TextBoxHilite.htc |
| HTM | Internet Web | 10572 | {5C91597B-F84F-41E6-AAC8-8D334BCBCB21}.htm |
| HTML | Internet Web | 24667 | access-elements-of-java-array.html |
| HTT | System | 14 | SEARCH.HTT |
| HTX | Internet Web | 45 | DELETE.HTX |
| HVE | 3D Image | 7 | Syscache.hve |
| HXC | Windows Help | 287 | OUTLOOK.DEV_COL.HXC |
| HXD | Windows Help | 73 | HxStoreMigrating.hxd |
| HXH | Windows Help | 9 | Hx_1033_MTOC_Hx.HxH |
| HXK | Windows Help | 564 | LYNC_ONLINE_F_COL.HXK |
| HXL | 3D Image | 24 | nslist.hxl |
| HXN | 3D Image | 278 | MS.INFOPATHEDITOR.12.1033.hxn |
| HXS | Internet Web | 287 | POWERPNT.DEV.HXS |
| HXT | Windows Help | 282 | WINPROJ_STD_COL.HXT |
| HXW | Settings | 18 | Hx_1033_MKWD_K.HxW |
| HXX | Developer | 12 | cscsearchapiif.hxx |
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