Read CHM
Read CHM is a macOS utility for opening and reading CHM (Compiled HTML) e-book files. CHM is a legacy Microsoft documentation format that was common in technical and reference materials before EPUB and PDF became standard. The app displays the document structure, allows browsing through chapters, and renders the HTML content. It is used by people who still maintain collections of older technical documentation, programming references, or e-books distributed in CHM format.
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1 suggestionRead CHM is a long-unmaintained Intel-only application — the developer has not shipped an update since the mid-2000s, and there is no native Apple Silicon build. The app currently runs under Rosetta 2 on M-series Macs, but Apple is removing Rosetta 2 support in macOS 28 (September 2028), which means Read CHM will stop launching entirely on that date. If you have a modest collection of CHM files you still need to access, the open-source Chmox reader (last updated 2005, similar age but also Intel-only) and web-based CHM viewers offer partial alternatives, though neither is actively maintained for Apple Silicon. For the best long-term compatibility, consider converting your CHM files to PDF or EPUB using free tools like Calibre — both formats are widely supported on modern macOS and will remain compatible as the platform evolves. If conversion is not practical and the CHM files are critical, consider archiving them with the software on external media as a contingency until September 2028.
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