I Exist

A developer working in Delphi/Pascal traced a baffling bug where FileExists incorrectly reported that existing files didn't exist. The root cause: FileExists relies on FileAge, which relies on the Windows API function FileTimeToDosDateTime to compute a timestamp; if the file's last-write time wasn't set by the process that created it, the conversion fails and its returned error code goes unchecked, causing FileAge to return -1 and FileExists to falsely report the file as missing.

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