There are registry entries to determine the Office version. I use it in my
Installshield script. The entries are dependent on Office version 9, 10,
11, etc.

The key a
Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\10.0\ Common\ProductVersion
Sub-Key: LastProduct

Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\ Common\ProductVersion
Sub-Key: LastProduct

For versions earlier than 10, MS does not put the ProductVersion key, in
such case, I check for the Excel key\InstallRoot and if I find it, I know
that Excel is installed. (In my case, I know that the user have to install
Excel, so my checking for Excel is valid)

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