A daily updated filename extension database!

HHK file extension

The table below provides useful information about the .hhk file extension. It answers questions such as:

  • What is the .hhk file?
  • What program do I need to open a .hhk file?
  • How can the .hhk file be opened, edited or printed?
  • How can I convert .hhk files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ HTML Help Index

HHK file is a HTML Help Index. HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools.
HHK format description not yet available
Application: Microsoft HTML Help
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
HHK aliases:
HHK related links:
HHK related extensions:
Windows Help File

Hypertext Markup Language Document

Compiled HTML Help

HTML Help Table of Contents

HTML Help AutoIndex

HTML Help Project

HTML Help Stop Words

Microsoft Sharepoint Site Template

HTML Help Collection

Microsoft Sharepoint Web Part Description

Other types of files may also use the .hhk file extension.

🚫 The .hhk file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

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

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Internet Explorer HTML Help Index
Cadfil Thickness Data
HTML-Kit Help File
Hex Workshop Bookmark File
C++ Header File
Hallmark Card Studio Document
HTML Help Header File
Visual Basic Data
HTK Format Parameter File
HHsearch Database

🔴 Can't open a .hhk file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .hhk file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .hhk file extension, write to us!

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