How To – Search All Files

Method 1:

Create a registry entry for the file extension: HKEY_CLASSES_ROOT\.zzz\PersistentHandler\(Default) = {5e941d80-bf96-11cd-b579-08002b30bfeb}

Method 2:

Index all files:

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

http://support.microsoft.com/kb/309173