Install 7-Zip (free/open-source) or WinRAR.
The filename appears to be a specific archive file often associated with technical datasets, firmware, or automotive diagnostic software packages [1, 2]. While the exact contents depend on the source, filenames with this structure are frequently found in specialized repositories for vehicle ECU (Engine Control Unit) tuning or technical hardware documentation. Understanding the Archive: A Technical Overview 06_-_18omg_259_g1311.rar
Look for a readme.txt or instructions.pdf file within the archive to understand how to use the included data. Install 7-Zip (free/open-source) or WinRAR