| haas | Everfine HAAS Test Results Data |
| had | Haydee Web Server Module Style |
| hal | HotDocs Answer Library |
| halog | IEInspector HTTP Analyzer Log |
| hamachi | Hamachi Client Data |
| har | E-Sword Harmony Resource |
| har | HTTP Archive |
| harx | E-Sword v9.1 Harmony Resource |
| hash | EnCase Forensics Hash File |
| hashdb | HashDB Database |
| hat | HOORA Analysis Tool Model Data |
| hb | Harwell Boeing Sparse Matrix |
| hb2 | HBPLUS Output Data |
| hbb | Line 6 POD HD Edit Bundle |
| hbc | Homebanking Computer Interface |
| hbci | Homebanking Computer Interface |
| hbd | HardlinkBackup Backup Definition |
| hbin | HITRAN Binary Output |
| hbk | HandyCafe Data |
| hbk | Hex Workshop Bookmark File |
| hbn | Java Hibernate Data |
| hbp | CLIC RAW Header Data |
| hbp | HBPredicT Output |
| hbs | Line 6 POD HD Edit Set List |
| hbx | BinHex 2.0 Encoded Data |
| hbx | HAHTsite HAHTtalk Widgets Data |
| hc3 | AquaChem v3 Database |
| hcc | HydroCAD Prefab Chamber |
| hcd | ICM Hourly Climatic Database |
| hce | HydroCAD Hydrograph File |
| hcg | HCLab Document |
| hch | General CADD Hatch |
| hci | HydroCAD IDF Curve |
| hcj | Hashcat Job Data |
| hck | MGS Hinge CK File |
