Definition - What does Route File mean?
A route file is a specific type of computer file that contains system customization settings and parameters that can be implemented to improve performance.
A route file is also known as a site customization file, Default.Route in Unix and Default.Rou in the Windows OS.
Techopedia explains Route File
A route file includes all the parameters a system needs to adapt to the resource requirements of any applications and utilities that are installed. The operating system will open and update the changes as described in the file to optimize itself for performance.
Route files are executed by overriding default system settings.