The common source format for a WinHelp project is an .HPJ file defining the help file's general properties, with a corresponding RTF file containing the actual help text. These files are used by the WinHelp compiler to create the final .HLP file.

Having a pair of .HPJ and .RTF files for an existing help project, you can use these files to convert by HTMLHelp Workshop. If you have troubles converting the existing .HPJ and .RTF files exported by your previous help authoring tool, use the decompiler instead.

If you have an existing WinHelp .HLP file without the .HPJ and .RTF source files only, you can use the WinHelp decompiler to recreate the HPJ and RTF sources from the HLP file. The decompiler will generate the .HPJ and *.RTF files, along with a series of bitmap files if the help file contains images.