Detect whether Office is 32bit or 64bit via the registry

Question

Now that Office also comes in a 64bit install, where in the registry do you find out if the version of Office installed is 32bit or 64bit?

Answer 1

Search the registry for the install path of the office component you are interested in, e.g. for Excel 2010 look in SOFTWARE(Wow6432Node)\Microsoft\Office\14.0\Excel\InstallRoot. It will only be either in the 32-bit registry or the 64-bit registry not both.