A daily updated filename extension database!

CHM file extension

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

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

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

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

✅ 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
Mime-type: application/x-chm
Magic number: -
Magic string: -
Sample: -
CHM aliases:
CHM related links:
CHM 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

MS Help 2 Project Attribute Definition

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

🔄 .chm converters

The following softwares are capable of converting .chm files to other formats:


For example, using the softwares above, a .chm file can be converted into one of the following formats:

html, txt, tcr, fb2, snb, cbr, rb, txtz, cbz, prc, lit, odt, pdb, djvu, epub

🚫 The .chm file extension is often given incorrectly!

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

cbm, cgm, ch, chh, chj, chk, chl, chn, cm, cmh, cmm, cnm, ctm, cym, dhm

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Saved File Fragment
Epidata Defined Checks
DB/TextWorks Check Textbase Problem Report
Gaussian Checkpoint File
GTA San Andreas CLEO Custom Mission
NucleoView Image Data
Siebel Server Shared Memory File
WhereIsIt Template File
CrazyTalk Model Data
Computer Graphics Metafile

🔴 Can't open a .chm 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 .chm 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 .chm file extension, write to us!

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Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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