| Extension | File Description |
| .HMU | Uncommon Files |
| .HMV | Uncommon Files |
| .HMW | Uncommon Files |
| .HMX | Misc Files |
| .HMXP | Data Files |
| .HMXZ | Data Files |
| .HMY | Uncommon Files |
| .HMZ | Uncommon Files |
| .HM~ | Uncommon Files |
| .HN0 | Uncommon Files |
| .HN1 | Uncommon Files |
| .HN2 | Uncommon Files |
| .HN3 | Uncommon Files |
| .HN4 | Uncommon Files |
| .HN5 | Uncommon Files |
| .HN6 | Uncommon Files |
| .HN7 | Uncommon Files |
| .HN8 | Uncommon Files |
| .HN9 | Uncommon Files |
| .HNA | Uncommon Files |
| .HNB | Uncommon Files |
| .HNC | Uncommon Files |
| .HND | Uncommon Files |
| .HNE | Uncommon Files |
| .HNF | Uncommon Files |
| .HNG | Uncommon Files |
| .HNH | Uncommon Files |
| .HNI | Uncommon Files |
| .HNJ | Uncommon Files |
| .HNK | Uncommon Files |
| .HNL | Uncommon Files |
| .HNM | Uncommon Files |
| .HNN | Uncommon Files |
| .HNO | Uncommon Files |
| .HNP | Uncommon Files |
| .HNQ | Uncommon Files |
| .HNR | Uncommon Files |
| .HNS | Uncommon Files |
| .HNT | Uncommon Files |
| .HNU | Uncommon Files |
| .HNV | Uncommon Files |
| .HNW | Uncommon Files |
| .HNX | Uncommon Files |
| .HNY | Uncommon Files |
| .HNZ | Uncommon Files |
| .HO | Uncommon Files |
| .HO0 | Uncommon Files |
| .HO1 | Uncommon Files |
| .HO2 | Uncommon Files |
| .HO3 | Uncommon Files |
| .HO4 | Uncommon Files |
| .HO5 | Uncommon Files |
| .HO6 | Uncommon Files |
| .HO7 | Uncommon Files |
| .HO8 | Uncommon Files |
| .HO9 | Uncommon Files |
| .HOA | Uncommon Files |
| .HOB | Uncommon Files |
| .HOC | Uncommon Files |
| .HOCKEY | Uncommon Files |
| .HOD | Uncommon Files |
| .HOE | Uncommon Files |
| .HOF | Uncommon Files |
| .HOG | Game Files |
| .HOH | Uncommon Files |
| .HOI | Uncommon Files |
| .HOJ | Uncommon Files |
| .HOK | Uncommon Files |
| .HOL | Data Files |
| .HOLES | Uncommon Files |
| .HOLLY | Uncommon Files |
| .HOM | Uncommon Files |
| .HOME | Uncommon Files |
| .HOME1 | Uncommon Files |
| .HOME2 | Uncommon Files |
| Extension | File Description |
| .HON | Uncommon Files |
| .HOO | Uncommon Files |
| .HOOD | Uncommon Files |
| .HOP | Uncommon Files |
| .HOQ | Uncommon Files |
| .HOR | Uncommon Files |
| .HORIZON1 | Uncommon Files |
| .HORIZON2 | Uncommon Files |
| .HORN | Uncommon Files |
| .HORNPIPE | Uncommon Files |
| .HOS | Uncommon Files |
| .HOT | Game Files |
| .HOTFONT | Uncommon Files |
| .HOTSPOT | Uncommon Files |
| .HOU | Uncommon Files |
| .HOV | Uncommon Files |
| .HOW | Uncommon Files |
| .HOX | Uncommon Files |
| .HOY | Uncommon Files |
| .HOZ | Uncommon Files |
| .HP | Uncommon Files |
| .HP$ | Uncommon Files |
| .HP- | Uncommon Files |
| .HP-UX | Uncommon Files |
| .HP0 | Uncommon Files |
| .HP1 | Uncommon Files |
| .HP2 | Uncommon Files |
| .HP3 | Uncommon Files |
| .HP4 | Uncommon Files |
| .HP5 | Uncommon Files |
| .HP6 | Uncommon Files |
| .HP7 | Uncommon Files |
| .HP8 | Uncommon Files |
| .HP9 | Uncommon Files |
| .HP? | Page Layout Files |
| .HPA | Uncommon Files |
| .HPB | Uncommon Files |
| .HPC | Uncommon Files |
| .HPD | Page Layout Files |
| .HPE | Uncommon Files |
| .HPF | Executable Files |
| .HPG | Vector Image Files |
| .HPGL | Vector Image Files |
| .HPH | Uncommon Files |
| .HPI | Raster Image Files |
| .HPIC | Uncommon Files |
| .HPID | Data Files |
| .HPJ | System Files |
| .HPK | Compressed Files |
| .HPL | Vector Image Files |
| .HPLJ | Uncommon Files |
| .HPM | Uncommon Files |
| .HPN | Uncommon Files |
| .HPO | Uncommon Files |
| .HPP | Developer Files |
| .HPPCL | Uncommon Files |
| .HPQ | Uncommon Files |
| .HPR | Uncommon Files |
| .HPR5 | Uncommon Files |
| .HPRJ | Uncommon Files |
| .HPRT | Uncommon Files |
| .HPS | Game Files |
| .HPT | Page Layout Files |
| .HPU | Uncommon Files |
| .HPUX | Uncommon Files |
| .HPV | Uncommon Files |
| .HPW | Uncommon Files |
| .HPX | Uncommon Files |
| .HPY | Uncommon Files |
| .HPZ | Uncommon Files |
| .HP_ | Uncommon Files |
| .HP~ | Uncommon Files |
| .HQ0 | Uncommon Files |
| .HQ1 | Uncommon Files |
| .HQ2 | Uncommon Files |
