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You do have that file--it handles much more than just tethering. If you're using the built-in File Explorer to view the Windows directory it is set to hide system files from view--go to the right softkey and choose "Show All Files".
But that file exists in a partially deconstructed form known as a module, so it would have been impossible for you to pull it off the device anyway. You need to dump a ROM image file on your PC and use a tool called recmod to reassemble the physical dll file. I've attached it for your perusal.
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