Unfortunately, the fact that you can't search the Help File isn't anything to do with the RootsMagic Developers or Microsoft. The limitation is a common 'feature' of all Windows programs 'converted' to run on Mac OSX using the WINE engine, which attempts to replicate a Windows environment on Linux and OS X. The WINE developers have not (yet) managed to fully replicate (or more correctly re-write) the code needed to make the Windows Help features work fully.
The only work-around options, as far as I am aware are:
- a CHM File reader as already mentioned above, or
- use a utility that can convert CHM files to PDF or e-Book format so that it can be viewed and searched externally. PDF is probably the best choice, as you can then launch the file in the Mac's Preview app when needed and keep it in the background.
"A Mac User with Windows & Linux Tendencies"
Windows Genealogy Software: Family Historian 6, Ancestral Sources, RootsMagic 7, Behold, Charting Companion