It might be a part of a split archive (indicated by the "_1") for personal data or technical logs.
It could be a compressed archive for a game mod, a "save file," or a configuration package created by a user with the handle "Seb" or "RuGe." Seb_RuGe_1.rar
Filenames with underscores and version-like numbers (like "1") often belong to private projects, custom automation scripts, or specialized software tools shared within specific communities. It might be a part of a split