| File Extension: | HHK |
| File Type Description: | HTML Help Index |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Microsoft HTML Help Workshop |
| Primary Software Developer: | Microsoft Corporation |
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The HHK file extension is a HTML Help Index file developed originally by Microsoft Corporation for Microsoft HTML Help Workshop. Data from our web servers (annonymous users) show that HHK files are most popular in China and are often used by Windows 10. In most cases, these users are surfing the internet using the Google Chrome browser.
 | Microsoft HTML Help Workshop by Microsoft Corporation |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .JNT | Microsoft Corporation | Data Files | Windows Journal File |
| .PMC | David Harris | Data Files | Pegasus Mail Filter Rule Files |
| .WME | Microsoft Corporation | Settings Files | Windows Media Encoder Session File |
| .MSH | Martin Schweiger | 3D Image Files | Orbiter 3D Mesh File |
| .LANG | Mojang | Game Files | Minecraft Language File |
| .MIN | Okuma | CAD Files | Okuma CNC Program File |
| .PRT | PTC | CAD Files | Pro/ENGINEER Part File |
| .EDI | Unknown Developer | Data Files | Electronic Data Interchange File |
| .HTT | Microsoft Corporation | System Files | Hypertext Template File |
| .SYS | Microsoft Corporation | System Files | Windows System File |
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