| H | Developer | 134 | _DataOracleClientPerfCounters_shared12_neutral.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_LinkTerm.H1K |
| H1S | Windows Help | 239 | netw.h1s |
| H1T | Windows Help | 4 | Help.H1T |
| H1W | Windows Help | 6 | Help_MKWD_AssetId.H1W |
| H264 | Video | 1 | broadcastpause720.h264 |
| HCP | CAD | 1 | StartTile.hcp |
| HDR | Raster Image | 13 | ENUT11M1.HDR |
| HEQ | Data | 1 | M1033Eva.HEQ |
| HEX | Encoded | 4 | usbdldv2.hex |
| HHK | System | 18 | scoped_5.hhk |
| HIT | Game | 5 | ResCache.hit |
| HKF | Data | 2 | netfxsbs12.hkf |
| HLP | Windows Help | 248 | MSINFO32.HLP |
| HLX | Data | 32 | EntityLookup.hlx |
| HOL | Data | 6 | OUTLOOK.HOL |
| HPI | Raster Image | 2 | HPEACLHN.HPI |
| HTC | Internet Web | 4 | MaxLength.htc |
| HTM | Internet Web | 749 | CUSUSRCH.HTM |
| HTML | Internet Web | 985 | retailDemoMsaInclusive.html |
| HTT | System | 11 | MANAGMNT.HTT |
| HTX | Internet Web | 45 | STYLE.HTX |
| HVE | 3D Image | 7 | Amcache.hve |
| HXC | Windows Help | 85 | MSACCESS_COL.HXC |
| HXD | Windows Help | 2 | Hx_1033_MValidator.HxD |
| HXH | Windows Help | 2 | Hx_1033_MTOC_Hx.HxH |
| HXK | Windows Help | 168 | LYNC_ONLINE_K_COL.HXK |
| HXL | 3D Image | 4 | nslist.hxl |
| HXN | 3D Image | 83 | MS.MSACCESS.DEV.14.1033.hxn |
| HXS | Internet Web | 85 | MSOUC.HXS |
| HXT | Windows Help | 84 | WINWORD_COL.HXT |
| HXW | Settings | 4 | Hx_1033_MKWD_NamedURL.HxW |
| HXX | Developer | 6 | esentprf.hxx |
/1 
日本語