Charlotte E. wrote:

Is it possible to test, if the user has a certain application installed
on this computer?

Or, to be specific, is it possible to test, if the user has "Google
Earth" installed on his windows-PC?

VBA Code?

Go to a computer that doesn't have Google Earth installed. Dump the registry.
(Yes, the whole thing.) Install Google Earth. Dump the registry again.
Compare. (There are tools that will do the dumping and comparing
automagically for you.)

Chances are, Google Earth sets something in the registry, even if it's
something as simple as the uninstaller's info. (I don't use it so I can't
tell you what.)

--
Fear is the penalty of consciousness.
There's no weakness in fear... only in showing it.