For example http://www.tink.ws/blog/macintosh-file-types/ notes the file types you could find in association with an app.
Armed with the file type the app uses you could search for those with that file type.
Bob
<span class="Apple-tab-span" style="white-space:pre"> How do I find all of the files that are associated with a program so that if I delete the program I can also delete everything associated with that program?

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