| H | Developer | 134 | _ServiceModelServicePerfCounters.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 | stylec.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 | ENUTG2P.HDR |
| HEQ | Data | 1 | M1033Eva.HEQ |
| HEX | Encoded | 4 | usbdldv2.hex |
| HHK | System | 18 | merged.hhk |
| HIT | Game | 5 | ResCache.hit |
| HKF | Data | 2 | netfxsbs12.hkf |
| HLP | Windows Help | 248 | MSACCDEF.HLP |
| HLX | Data | 32 | EntityLookup.hlx |
| HOL | Data | 6 | OUTLOOK.HOL |
| HPI | Raster Image | 2 | HPEACLHN.HPI |
| HTC | Internet Web | 4 | DATACONN.HTC |
| HTM | Internet Web | 749 | ACREAD10.HTM |
| HTML | Internet Web | 985 | unifiedEnrollmentOnPremAuth.html |
| HTT | System | 11 | Desktop.htt |
| HTX | Internet Web | 45 | SERVX.HTX |
| HVE | 3D Image | 7 | Syscache.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 | MSE_F_COL.HXK |
| HXL | 3D Image | 4 | nslist.hxl |
| HXN | 3D Image | 83 | MS.MSTORE.14.1033.hxn |
| HXS | Internet Web | 85 | WINWORD.DEV.HXS |
| HXT | Windows Help | 84 | OIS_COL.HXT |
| HXW | Settings | 4 | Hx_1033_MKWD_NamedURL.HxW |
| HXX | Developer | 6 | esentprf.hxx |
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