Add a new File Type to Indexing in Windows Vista
Windows Vista has a new built-in searching engine that is completely integrated into the operating system, but not all files are indexed. To add a new file type to be indexed, you just have to follow a couple of steps.
To get to the indexing service panel, just type index into the start menu search box, and hit enter.

In the Indexing Options window, click the Advanced button:

Now, type in the new extension and click “Add new extension”

If you want the file contents to be indexed as well, find the file type in the list and make sure you select the “Index Properties and File Contents” radio button.

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Windows indexing on my vista machine yeilds incomplete results regardless of what the file type is
I have completely lost the .exe file extension. So I am unable to run rundll32.exe, which is obviously what we are trying to run when we search for index.
How would I add the .exe file extension a different way?
BRAVO! and thanks. I’ve been looking for this info for days. G’ bless.