The file extension stands for Rainlendar 2 License .

Comprehensive Guide to the Rainlendar License R2LIC The is the proprietary license file used to unlock the full potential of Rainlendar Pro , a highly customizable desktop calendar application. While the "Lite" version is free, the Pro version offers advanced features like cloud synchronization and multi-calendar support, which are activated by installing this specific file. Understanding the .r2lic File

You can, but it will contain encrypted gibberish. The data is not human-readable. Do not edit the file—it will break the signature and invalidate the license.