Citation :
Search also has a small blockage when it comes to searching for text within certain files. Originally Microsoft set it so Windows would ignore all files that are not registered with a filter, although recent updates and Service Packs have added many more file types. If there's still a file type that Windows is not searching, you can manually add a text filter to the file by Running regedit, and browsing to HKEY_CLASSES_ROOT and the file extension you're interested in. Then create a new key called PersistentHandler, and in the key, set the Default string value to {5e941d80-bf96-11cd-b579-08002b30bfeb}. Restart, and you should be able to search for text within that file type.
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