How to include PDF of rulebook in VASSAL module help menu.

(1) Put your PDF in a directory on its own (e.g. in a "help" subdirectory of where you keep your original art files, etc).

(2) Right click the Help Menu and Add HTML Help File.

(3) Set the "Contents" to the directory (on your own hard drive, not in the Vassal vmod/zip file)

(4) Set the Starting Page as the pdf file name.

Save module and you should be good to go.