How to find all the files on your Mac of a particular type or extension

I find myself regularly needing to limit a search to a particular kind of file, like images or mail messages. Or I know that I have a limited number of files on my Mac of a certain kind, like those created by OmniGraffle, and I can’t remember the file name—just that I created it in OmniGraffle! You can use Spotlight in the Finder or create a smart folder for repeated uses that will fit this need. In the Finder,

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