PRO is a file extension for configuration data used by Pro/ENGINEER CAD software. PRO stands for PROfile. The config.pro file is used for setting startup options, such as enabling hardware or software video acceleration.Learn more about .PRO files: Visit the PTC web page.RO stands for PROfile. The config.pro file is used for setting startup options, such as enabling hardware or software video acceleration. Learn more about .PRO files: Visit the PTC web page.