It is common practice to create RAR archives of log or configuration files and name them with the current date (DD.MM.YYYY) to maintain chronological backups. This file might be a manual or automated backup of a server, database, or application environment from that day.
If you received this file from an unknown source or found it in a public forum, exercise caution before opening it. Configuration files can sometimes be used to deliver malicious scripts or executables. Always scan such files with antivirus software before extraction. Where did you find this specific file , and CONFIG 03.05.2023.rar
File Naming Conventions - Harvard Biomedical Data Management It is common practice to create RAR archives