| H | Developer | 9797 | op_freeze.h |
| H1C | Windows Help | 4 | Windows.h1c |
| H1D | Windows Help | 4 | Help_CValidator.H1D |
| H1H | Windows Help | 2 | Help_MTOC_help.H1H |
| H1K | Windows Help | 16 | Help_SubjectTerm.H1K |
| H1S | Windows Help | 239 | artico.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 | IrisDisplacement.HDR |
| HEQ | Data | 1 | M1033Eva.HEQ |
| HEX | Encoded | 4 | usbdload.hex |
| HHK | System | 20 | merged.hhk |
| HIT | Game | 5 | ResCache.hit |
| HKF | Data | 5 | NETFXSBS10.hkf |
| HLP | Windows Help | 374 | Danish.hlp |
| HLX | Data | 32 | Streets244.hlx |
| HOL | Data | 13 | OUTLOOK.HOL |
| HPI | Raster Image | 2 | HPEACLHN.HPI |
| HTC | Internet Web | 24 | csshover3.htc |
| HTM | Internet Web | 10572 | TT_Rows_Columns_Split_Cells.htm |
| HTML | Internet Web | 24667 | pass-python-function-to-python-map-function.html |
| HTT | System | 14 | WORKSPC.HTT |
| HTX | Internet Web | 45 | LOGINCHK.HTX |
| HVE | 3D Image | 7 | Amcache.hve |
| HXC | Windows Help | 287 | VISIO.SHAPESHEET_COL.HXC |
| HXD | Windows Help | 73 | Hx_1033_MValidator.HxD |
| HXH | Windows Help | 9 | Hx_1033_MTOC_Hx.HxH |
| HXK | Windows Help | 564 | INFOPATHEDITOR_K_COL.HXK |
| HXL | 3D Image | 24 | nslist.hxl |
| HXN | 3D Image | 278 | MS.INFOPATH.12.1033.hxn |
| HXS | Internet Web | 287 | ONENOTE.HXS |
| HXT | Windows Help | 282 | ONENOTE_COL.HXT |
| HXW | Settings | 18 | Hx_1033_MKWD_K.HxW |
| HXX | Developer | 12 | extension.hxx |
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