A quick search for Mac CHM viewers yields a handful of open source & shareware apps which provide Mac users access to Windows help files in the Compiled HTML Help (CHM) format. A few older shareware apps such as Chimp and CHM Viewer are only available in PowerPC versions and apparently no longer actively developed. [...]
Content Strategy Forum London
Spaces in HTML Help Project Paths
Like so many other applications, Microsoft’s HTML Help Workshop often chokes on project files whose paths contain spaces. If you double-click a HTML Help Project File (HHP) in a location whose path contains spaces, the HTML Help Workshop throws an error when you click the Compile button and refuses to compile the CHM file. Cannot [...]