Likely causes:
1. Dont have the thing on a network drive.
2. Make suer there are no '#' characters in the path to the file
3. Unblock the file
In order to view this help file under Vista/Xp right click the file,
choose properties, In the lower right hand corner of the screen you
should see a button that says Unblock. Click it, accept the prompt that
appears and click OK.
Now you should be able to view the help with out any issues..
hth, -jr-