Restrict file types on Manufacturer Part

Hi, I would like to restrict the file types available to add to a Manufacturer Part to say .pdf and .png . I imagine a kind of filter on the file dialog that pops up when I create a new relationship on an item.  How would I go about that? I realize there is a File Type item type, I just don't know how to use it, or if I need it at all. All inputs appreciated   --Carsten
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