What is ExtraCHM?
ExtraCHM is a free, open-source CHM file reader and browser for Windows. CHM stands for Compiled HTML and is a common file format used for software documentation and help files.
Key features of ExtraCHM include:
- Lightweight and fast - uses little memory or CPU
- Supports CHM version 1.0 up to latest 3.0
- Tabbed interface for opening multiple CHM files
- Table of contents, index, search, bookmarks
- Printing support
- Customizable interface colors
- Portable version available
ExtraCHM is easy to use even for less tech-savvy users. It opens quickly and makes navigating CHM help contents intuitive. The search feature allows finding information fast across all opened CHM files.
It's a good alternative if you need to open CHM files and the default Windows help viewer doesn't work well or lack features you need. Being open-source means ExtraCHM is free to use with no ads or unwanted bundles.