Is there a de-compiler for WinHelp files?
There are several decompilers offered by HAT vendors, and also an excellent freeware utility called HelpDeco. Which one you should use depends on how much information you want to retain from the help file. If you have a HAT, check the documentation to see if you already have a decompiler. If you don’t have a decompiler, or if the one you have doesn’t retain hotspots, context strings and mapping information, get the free HelpDeco. It’s currently at version 2.1, which supports all versions of WinHelp and Viewer (and I believe MediaView files as well). It’s available from a number of internet sites, including www.helpmaster.com and the library section at www.wextech.com.