Opening a CH_ File

The CH_ file type is primarily associated with Microsoft HTML Help.

CH_	File extension: CH_
	File type:	compressed archive

What is a CH_ file

CH_ files mostly belong to Microsoft HTML Help. Most CH_ files are Microsoft Compressed HTML Help files that store support documentation in a compressed HTML format. They use an internal format called CAP to bundle HTML pages, images, and other content into one compact file. You can view these files with Microsoft HTML Help Viewer.
For more details, check the official documentation at Microsoft.
Some CH_ files are used in a different context. They serve in Brother printer firmware as compressed font files that help the printer render text correctly. These files are handled by proprietary printer utilities.

Microsoft Help Files: Compiled using the CAP format, they combine multiple help resources in one file.
Printer Firmware: Used by Brother printers, they contain compressed font data critical for printing operations.
Usage Note: Confirm your file’s origin. If it’s for help documentation, use Microsoft tools; if it’s from your printer, check Brother utilities.

How to open CH_ files

You need a suitable software like Microsoft HTML Help to open a CH_ file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CH_ file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CH_ file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CH_ Text Viewer

Choose your .ch_ file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert CH_ files:

Microsoft HTML Help
See the previous paragraphs to learn more about the main application. CH_ files are often referred to as Microsoft HTML Help compresseds because this type of file is primarily created or used by this software.
Microsoft HTML Help Workshop, Brother printer firmware
The *.ch_ file extension represents primarily two distinct file types. First, commonly associated with Microsoft's Compiled HTML Help system, these files store compressed HTML content, often used for help documentation. Second, they can also represent compressed font files used by Brother printers, typically for storing firmware updates or additional font resources. This file format is classified as Compressed Files.

Technical Data for CH_ File Extension

File classification:

Compressed

Related files:

chm, hlp, ch, dl_, dsi, ini, hcw, hhc, cab, zip, exe

a ch_ compressed archive is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CH_ files

Associate the CH_ file extension with the correct application.
Update your software that should actually open compressed archives. Because only the current version supports the latest CH_ file format. Search, therefore, e.g. on the manufacturer website after an available Microsoft HTML Help update.
To make sure that your CH_ file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
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