A product customization file can be specified via command line parameter: -pluginCustomization <path to file>
Example product customization file contents, to specify large file associations:
# all types with a preference, needed by the preference page UI org.eclipse.ui.workbench/largeFileLimits_types=java,xml,txt org.eclipse.ui.workbench/largeFileLimits_disabled=cpp # default, show prompt for all to types that don't have a preference org.eclipse.ui.workbench/largeFileLimits_default_enabled=true org.eclipse.ui.workbench/largeFileLimits_default_value=100000 # specific editor associations per type and file size org.eclipse.ui.workbench/largeFileLimits.java=4096,org.eclipse.ui.DefaultTextEditor,8192,largeFileLimits_prompt org.eclipse.ui.workbench/largeFileLimits.xml=1048576,org.eclipse.ui.DefaultTextEditor,77777,Emacs org.eclipse.ui.workbench/largeFileLimits.txt=2048,largeFileLimits_prompt