: The .003 extension indicates that a larger archive (likely named 15-09-2019.7z ) was broken into smaller pieces for easier sharing or storage.
Large logs used by IT professionals (if the file is from a known source). How to Open It 15-09-2019.7z.003
: The date 15-09-2019 suggests the archive contains backups, logs, or photos from September 15, 2019. Security Warning or photos from September 15