This tool converts the now-obsolete project files created with Help+Manual 3 (.hm3) and 4 (.hmx) to the current Help+Manual XML format. It also has a command line interface so that you can convert multiple files with batch files. See Project converter syntax in the Command Line Options chapter for details.
You can convert old projects directly by opening them. Just click on the File menu, select Open, choose the project type you want to open and follow the instructions displayed. This will also give you the option of opening the external converter program.
You can also open the Project Converter manually by selecting it in the Help+Manual program group in the windows Start menu. This gives you more control over the conversion options.