This is a bug. Our intent is that if you have the .NET Framework SDK installed, you should be able to use National Instruments .NET class library documentation. The help is being installed, but not registered. We will look into why this is happening. We should be able to post something that will register the help in the collection.
In the meantime, you can use a standalone viewer to get access to the help. I suggest H2Viewer from The Helpware Group. You can download it from here:
http://helpware.net/mshelp2/h2viewer.htm. Unzip the files in the archive, run H2Viewer.exe, and choose "NI.MeasurementStudio". This gives you access to all Measurement Studio help content, including the DAQmx help.
We'll pos
t a followup to let you know if we can make something available to register the DAQmx help in the Framework SDK collection.
Incidentally, could you please post back to let us know what environment or tools you are using instead of Visual Studio?