Default system properties are defined in the md.system.properties file which is located at your_installation_directory/Tools/Build/Runtime/v1.0.0.

In the md.system.properties file, you can see which properties are used by Mobile Designer. To change the default settings, you must create a new system.properties file in the root folder of your project. In this file, you can override the default values.

To use a specific system.properties file, specify the path and name of this file in the Ant property custom.system.properties.

For example, you can insert the following line in your _defaults_.xml file to use the release.system.properties file from your root project folder: <property name="custom.system.properties" value="release.system.properties"/>