The file is not a standard system file or a widely recognized component of popular software. Based on its highly unusual name, it is almost certainly a custom configuration file used in a specific, often clandestine or unofficial, context. Likely Origin and Purpose
A developer may have named it this way as a joke for a private project, intentionally making it sound suspicious while it performs standard configuration tasks. General Structure of .ini Files SupeLegitConfig.ini
Read/Write Config.ini (CMS) - The Official Visionaire Studio The file is not a standard system file