How to capture origional client machine _directory_ and file name on uploads?

This should be trivial, but apparently not -- or maybe I just need more caffeine. My searches have come up empty. I am trying to get not only the original file name on uploads, but also the original directory on the client machine as well. The purpose is for users who make a mistake on another part of the form; when the form is returned for them to complete properly, all of the correct values are automatically filled in. That's trivial in most instances, but I'm not finding a solution for file uploads. This seems like a common need. Any suggestions? Thanks in advance, Jeff