Filename Extensions
If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .chm

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

Below, you can find answers to the following questions:

  • What is the .chm file?
  • Which program can create the .chm file?
  • Where can you find a description of the .chm format?
  • What can convert .chm files to a different format?
  • Which MIME-type is associated with the .chm extension?
Compiled HTML Help .chm file icon

Compiled HTML Help

CHM file is a Compiled HTML Help. HTML Help is the standard help system for the Windows platform. The HTML Help compiler (part of the HTML Help Workshop) makes it possible to compress HTML, graphic, and other files into a relatively small compiled help (.chm) file.
Category: Document files
Application: HTML Help Workshop
Program name: -
Mime-type: application/x-chm
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
Windows Global Index File
Windows Help File
Hypertext Markup Language Document
Answer Wizard Index
HTML Help Table of Contents
Multipurpose Internet Mail Extension HTML
ColdFusion Markup Language
Windows Help Project
HTML Document with SSI

Other types of files may also use the .chm file extension. If you have helpful information about .chm extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

WhereIsIt Template File
Siebel Server Shared Memory File
Gaussian Checkpoint File
Saved File Fragment
Epidata Defined Checks
DB/TextWorks Check Textbase Problem Report
Color FBM Image
ChessBase Multimedia Baggage Data
PLINK Cochran Mantel Haenszel 2x2xK Test Report

The .chm filename extension is often given incorrectly!

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

chk (24), cbm (10), ctm (8), shm (7), chn (6), cm (6), cmh (5), chl (5), ch (5), cnm (4), cgm (4), cmm (4), hm (3), hcm (2), dhm (2)

Can't open a .chm file?

If you want to open a .chm file on your computer, you just need to have the appropriate program installed. If the .chm association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.chm

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 from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2003/2008/2012, Windows 7, Windows 8, Linux, FreeBSD, NetBSD, OpenBSD, Mac OS X, iOS, Android

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