| H | Developer | 9797 | fltwinerror.h |
| H1C | Windows Help | 4 | Help.h1c |
| H1D | Windows Help | 4 | Help_MValidator.H1D |
| H1H | Windows Help | 2 | Help_MTOC_help.H1H |
| H1K | Windows Help | 16 | Windows_SubjectTerm.H1K |
| H1S | Windows Help | 239 | legapp2.h1s |
| H1T | Windows Help | 4 | Windows.H1T |
| H1W | Windows Help | 6 | Help_MKWD_AssetId.H1W |
| H264 | Video | 3 | broadcastpause720.h264 |
| HASH | | 8 | i641033.hash |
| HCP | CAD | 65 | StartTile.hcp |
| HDR | Raster Image | 117 | ENUT11M1.HDR |
| HEQ | Data | 1 | M1033Eva.HEQ |
| HEX | Encoded | 4 | usbdldv2.hex |
| HHK | System | 20 | scoped_5.hhk |
| HIT | Game | 5 | ResCache.hit |
| HKF | Data | 5 | NETFXSBS10.hkf |
| HLP | Windows Help | 374 | ident.hlp |
| HLX | Data | 32 | EntityNameLength.hlx |
| HOL | Data | 13 | OUTLOOK.HOL |
| HPI | Raster Image | 2 | HPEACLHN.HPI |
| HTC | Internet Web | 24 | pie.htc |
| HTM | Internet Web | 10572 | CleantouchGeneralProductionSystem.htm |
| HTML | Internet Web | 24667 | perlboot.html |
| HTT | System | 14 | SMARTF.HTT |
| HTX | Internet Web | 45 | NAVIGATE.HTX |
| HVE | 3D Image | 7 | Syscache.hve |
| HXC | Windows Help | 287 | GRAPH_COL.HXC |
| HXD | Windows Help | 73 | Hx_1033_MValidator.HxD |
| HXH | Windows Help | 9 | Hx_1033_MTOC_Hx.HxH |
| HXK | Windows Help | 564 | INFOPATH_K_COL.HXK |
| HXL | 3D Image | 24 | nslist.hxl |
| HXN | 3D Image | 278 | MS.VISIO.SHAPESHEET.14.1033.hxn |
| HXS | Internet Web | 287 | EXCEL.HXS |
| HXT | Windows Help | 282 | LYNC_ONLINE_COL.HXT |
| HXW | Settings | 18 | Hx_1033_MKWD_K.HxW |
| HXX | Developer | 12 | extension.hxx |
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