CHM Types

Leading CHM Type

.CHM

File Ext:	.chm
Category:	Compiled HTML Help File

A CHM file is a help documentation used as an online help solution by Windows and other programs. It is compiled and saved in a compressed HTML format.

Developer:	Microsoft Corporation
Kind:	Web Files
Key:	HKEY_CLASSES_ROOT\.chm

Software Programs That Open The Compiled HTML Help File:

Mozilla Firefox by Mozilla

Windows

	Mac
	iOS

Android

Linux

Solaris

illumos

Apple Safari by Apple

Windows

	Mac
	iOS

Android

Linux

Solaris

illumos

Microsoft HTML Help Workshop by Microsoft Corporation

Windows

Microsoft Windows Help by Microsoft Corporation

Windows

xCHM by Open Source

Windows

Mac

Linux

Solaris

	BSD
	Unix

CHM Decoder by GridinSoft LLC

Windows

CHM Editor by GridinSoft LLC

Windows

WinCHM by Softany Software

Windows

Guohua ChmDecompiler by Guohua Software

Windows

Alternative CHM Types

.CHM

File Ext:	.chm
Category:	Chameleon Source Font

Font file associated with Chameleon, a technology developed by Ares Software for font management and included in Apple's operating system.

Developer:	Apple
Kind:	Font Files

Software Programs That Open Chameleon Source Font Files:

macOS by Apple

Compatible with:

Mac

Apple OS X by Apple

Compatible with:

Mac

.CHM

File Ext:	.chm
Category:	ChemDraw Chemical Structure File

Document created in ChemDraw, a chemical drawing solution. CHM file is used for saving or opening ChemDraw documents using the version 3.5.x of ChemDraw.

Developer:	PerkinElmer
Kind:	Data Files

Software Programs That Open ChemDraw Chemical Structure File Files:

ChemDraw by PerkinElmer

Compatible with:

Windows

	Mac
	iOS

.CHM

File Ext:	.chm
Category:	Two Worlds 2 Animation File

Animation file associated with Two Worlds II, a fantasy role-playing (RPG) video game developed by Reality Pump Studios.

Developer:	Reality Pump Studios
Kind:	Game Files

Software Programs That Open Two Worlds 2 Animation File Files:

Two World II by Reality Pump Studios

Compatible with:

Windows

Mac

Playstation 3 System Software

Xbox 360

.CHM

File Ext:	.chm
Category:	SWAT Soil Chemical Input File

CHM file is a soil chemical input file, it contains information about the initial nutrient and pesticide levels of the soil in the HRU.

Developer:	Grassland, Soil and Water Research Laboratory
Kind:	Data Files

Software Programs That Open SWAT Soil Chemical Input File Files:

SWAT by Grassland, Soil and Water Research Laboratory

Compatible with:

Windows

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Troubleshooting Problems Opening CHM Files

Common Problems Opening CHM Files

Mozilla Firefox Isn't There

You attempt to load your CHM file and get an error such as "%%os%% Can't Open The CHM File Extension". Generally, this is experienced in %%os%% because Mozilla Firefox isn't installed on your PC. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: If you know of another program that can open your CHM file, you can try opening it by selecting the application from the programs listed.

Wrong Version of Mozilla Firefox is Installed

In some cases, you might have a newer (or older) version of a Compiled HTML Help File file that is unsupported by your installed application version. If you've got the wrong version of Mozilla Firefox installed, you'll need to install the correct version. This issue mainly occurs when your Compiled HTML Help File file was created by a newer version of Mozilla Firefox than you have on your PC.

Tip: Right-clicking on your CHM, then clicking "Properties" (Windows) or "Get Info" (Mac), can provide clues about your file version.

Ultimately, most of the difficulties opening CHM files are due to having the wrong version of Mozilla Firefox installed.

Associated Difficulties Loading CHM Files

Assuming you have the right Mozilla Firefox version installed, other problems can prevent you from opening CHM files. There can be other issues - unrelated to software - preventing you from opening CHM files. These other problems include (listed in order from most to least common):

• CHM file type Registry entries are wrong
• Deletion of the CHM file description from the Registry by mistake
• Invalid installation of a CHM-associated program (eg. Mozilla Firefox)
• File corruption affecting your CHM file
• Malware-tainted CHM file can't be opened
• Hardware associated with CHM has outdated drivers
• Windows has inadequate resources to open your Compiled HTML Help File file