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Informations about the HHK filename extension and the file formats associated with it

We collected the information you should know about the .hhk filename on this page. If you were sent a(n) .hhk file in an e-mail, but you don’t know what to do with it, then you can find help here. We strive to suggest free, open-source applications that are available to everyone for the file formats.

1 filename extension(s) are in our database

.hhk - HTML Help Index

The HHK file is a Development file, which is connected to the HTML Help Index according to our registry. With the adequate settings, the HTML Help Index (.hhk) files can be opened or converted with the help of Microsoft HTML Help.

Format description:
HHK format
Microsoft HTML Help
Magic string:
- / -
Related links:
Related extensions:
HTML Help Table of Contents
HTML Help Project
HTML Help Stop Words

Important! Programs other than the ones listed above may also use the .hhk file extension. Even harmful programs can create files with the .hhk extension to store data in them. Always be careful with .hhk files coming from unknown sources. Don’t open executable files that arrived in mails, even if you know the sender.

The .hhk file can’t be opened on your computer?

If the program necessary for opening the .hhk file is installed properly on your computer, then the quickest and simplest way to open the .hhk file is to double-click on the file’s name. If that doesn’t work, then the right software probably isn’t installed on your computer.

While opening the .hhk file, you may receive an error message from the associated application, this can be caused by the following:

Incorrectly given .hhk extension

The .hhk filename extension can be given incorrectly sometimes. The cause of the error could be a mistake or a simple typo. We found the following incorrectly given filename extensions that are the most frequent in the case of .hhk files.

hbk, htk, hkh, hhm, hh, mhk, hmk, hk, hhl

Maybe you’re not even looking for the .hhk file extension?

It’s possible the the file’s extension was given incorrectly. Below, we list some filename extensions that are similar to the .hhk extension. It’s possible that the one you’re looking for is among them.

Hex Workshop Bookmark File
HTK Format Parameter File
HTML Help Header File
Myst Game Data
HHsearch Database
C++ Header File

Associated applications

The Windows operating system stores information about the applications associated to the file extensions in the registry database. The associations can be queried or modified in the Command Prompt window with the "assoc" command.

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We gladly accept application suggestions, but our primary goal is to suggest reliable, open-source applications that can be freely distributed to the users.

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