You will need a tool like WinRAR, 7-Zip , or The Unarchiver to extract and view the individual configuration files inside.
A major version archive for CIMCO Edit 8 (Version 8.12.51) was released specifically on 03.05.2023 . Files with "CONFIG" in the name often contain specific machine parameters or license settings used by this type of industrial software. CONFIG 03.05.2023.rar
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. You will need a tool like WinRAR, 7-Zip