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When you search for a specific string, using the built in search component - windows may not search unknown file types!

A really a simple registry hack will fix the problem.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ContentIndex
FilterFilesWithUnknownExtensions=1

0 ignore file, 1 search them all

http://support.microsoft.com/default.aspx?scid=kb;en-us;309173