We're having the same problem. We have the .htm in our source files and it's installed along with the application. The path for Documentation is correct in the VI properties. The "Help for this VI" is available on the Help menu of the application, but nothing happens when it's clicked. We've made sure that the .rtm and .ini files are also included as Support Files. The help .htm is available when running the VI under the development environment (LabView 6.1).