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Filename extension
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Informations about the H1H filename extension and the file formats associated with it

We collected the information you should know about the .h1h filename on this page. If you were sent a(n) .h1h 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

.h1h - Microsoft Help Merged Hierarchy File

The H1H file is a Data file, which is connected to the Microsoft Help Merged Hierarchy File according to our registry. With the adequate settings, the Microsoft Help Merged Hierarchy File (.h1h) files can be opened or converted with the help of Microsoft Windows Help.

Format description:
H1H format description not yet available
Microsoft Windows Help
Magic string:
- / -
Related links:
Related extensions:
Windows Help Bookmark
Microsoft Help Collection Definition
Microsoft Help Validator File
Microsoft Help Keywords Index
Microsoft Help Merged Query Index
Microsoft Help Compiled Help Data

Important! Programs other than the ones listed above may also use the .h1h file extension. Even harmful programs can create files with the .h1h extension to store data in them. Always be careful with .h1h files coming from unknown sources. Don’t open executable files that arrived in mails, even if you know the sender.

The .h1h file can’t be opened on your computer?

If the program necessary for opening the .h1h file is installed properly on your computer, then the quickest and simplest way to open the .h1h 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 .h1h file, you may receive an error message from the associated application, this can be caused by the following:

Incorrectly given .h1h extension

The .h1h 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 .h1h files.

h1t, hh, hlh

Maybe you’re not even looking for the .h1h file extension?

It’s possible the the file’s extension was given incorrectly. Below, we list some filename extensions that are similar to the .h1h extension. It’s possible that the one you’re looking for is among them.

Microsoft Help Topic Definition
HTML Help Header File
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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