>> HHK file

HHK file format description

Many people share .hhk files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .hhk file can be edited, converted or printed with. On this page, we try to provide assistance for handling .hhk files.

1 filename extension(s) found in our database.

.hhk - HTML Help Index

The HHK development files are related to Microsoft HTML Help. 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.

Microsoft HTML Help
Development files
- / -
HTML Help Index related extensions:
FTDI MProg Data
Xilinx ISE Verilog Test Bench
Xilinx ISE VHDL Test Bench
ACME Assembler Source Code
Microsoft Windows 8.1 Encrypted App Bundle Package
thinBasic Console Script

Naturally, other applications may also use the .hhk file extension. Even harmful programs can create .hhk files. Be especially cautious with .hhk files coming from an unknown source!

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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

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?

Similar file extensions in our database:

HTK Format Parameter File
Myst Game Data
Cadfil Thickness Data
Hex Workshop Bookmark File
C++ Header File
Hallmark Card Studio Document

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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If you have useful information about the .hhk file format, then write to us!

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