We have this challenge at our site. When we first designed it many years ago, we decided that the best way to store files was with a unique identifier, which matched one of the fields in the corresponding record. For example, if the unique identifier was a nine-digit field (such as a SSN), we'd save a file as nnnnnnnnn.ext, where nnnnnnnnn is the nine-digit number, and ext is the file extension. If we needed a change to the file, we'd file as nnnnnnnnn_hdate.ext, where hdate is the horolog date.

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