This specific version is highly regarded in the modding community because it was the stable standard for over two years before the release of the "Anniversary Edition" (v1.6+), which broke many popular mods. Core Purpose of the File
The file is a compressed archive containing an update or downgrade patch for The Elder Scrolls V: Skyrim Special Edition (SSE) , specifically targeting version 1.5.97 . sc5943-TESVSSEUpd1597 (2).rar