The extentsion and its description (if you have
provided any) and the action on it like open, print
get listed at appropiate places in the registry.
This you can check by running the setup and
making a doc with the extension you mentioned in
the setup project, and see if the explorer
provides its appropriate description.
You can also confirm this by opening registry
(regedit)- among many other extenstions listed
under HKEY_CLASSES_ROOT you can find the extension you defined in your setup project.
Also lets say if the document name you difined
for this extension is ABC, you will find an
entry ABC under the same key with all the
operations like print open listed under shell
.Net and C++ Specialist
Wiley Tech Support