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.CHM File Extension

File TypeCompiled HTML Help File

4.0 (63 Votes)
CategoryWeb Files

What is a CHM file?

A CHM file contains help documentation compiled and saved in a compressed HTML format. It may include text, images, and hyperlinks. CHM files are used by Windows programs as an online help solution.

More Information

As help documentation has improved and progressed toward website and browser-based formats, the CHM format has largely been retired. Most programs no longer use CHM-based help documentation, and most programs that previously opened CHM files are either unmaintained or no longer open CHM files.

NOTE: CHM files are compressed using the LZX compression format.

How do I open a CHM file?

In Windows, you can open a CHM file by double-clicking it. When you do, the CHM file will appear within Microsoft HTML Help Executable.

Open and view .CHM files with File Viewer Plus.

Programs that open CHM files

Updated 6/22/2020

About CHM Files

Our goal is to help you understand what a file with a *.chm suffix is and how to open it.

The Compiled HTML Help file type, file format description, and Windows programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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