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Navigation: Home > CHM file

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

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

.chm - Compiled HTML Help

The CHM file is a Document file, which is connected to the Compiled HTML Help according to our registry. With the adequate settings, the Compiled HTML Help (.chm) files can be opened or converted with the help of HTML Help Workshop.

Format description:
CHM format
HTML Help Workshop
Magic string:
- / -
Related links:
Related extensions:
HTML Help Collection

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

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

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

Incorrectly given .chm extension

The .chm 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 .chm files.

shm, cbm, hcm, dhm, cnm, cmh, chn, chk, chh, vhm, cgm, hm, fhm, ctm, cmm

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

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

Color FBM Image
WinHelp Context ID
Corel Multimedia Manager v7 Album
Gaussian Checkpoint File
ChessBase Multimedia Baggage Data
Siebel Server Shared Memory 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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