Basic Customization > Windchill Customization Basics > Managing Customizations > Best Practices for Customizing Files Supplied by PTC > Managing codebase Property Files
  
Managing codebase Property Files
In most cases, the property files (*.properties) in the codebase directories should only be modified by using PTC tools, and never manually edited. This is a major change from previous Windchill releases, where editing property files was very common. There are two key points regarding property files:
Use either the xconfmanager utility to make property file changes. Additional information on these topics is covered in the next two sections.
When you cause a property file to be changed, you may need to update downloadable client JAR files. Make sure to consult Managing Client JAR Files.