| File Extension: | OH |
| File Type Description: | DrillAssistant List Data File |
| File Type Developer: | Efka-Soft |
| Primary Associated Software: | DrillAssistant |
| Primary Software Developer: | Efka-Soft |
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Efka-Soft created the DrillAssistant List Data File (OH) file for the DrillAssistant software series. User statistics infer that these OH files are popular with users from United States and most frequently found on the Windows 10 platform. Most of these users are running the Google Chrome web browser.
 | DrillAssistant by Efka-Soft |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .OH4 | Efka-Soft | Data Files | Overhoor List File |
| .OHW | Efka-Soft | Data Files | DrillAssistant List File |
| .PBK | Microsoft Corporation | Data Files | Dial-Up Phone Book File |
| .SPH | National Institute of Standards and Technology (NIST) | Audio Files | NIST SPHERE Audio File |
| .SAMPLE | Unknown Developer | Data Files | Saved Sample |
| .SEV | Open Source | Disk Image Files | SevenUp Picture |
| .TITLE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
| .FISH | Unknown Developer | Data Files | 3D Fish Tank File |
| .GHT | Symantec Corporation | Data Files | Norton Ghost Project |
| .LEV | Interscape | Game Files | NetHack Level File |
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