About configuration files
files can be used by the command-line utilities and Flash Builder compilers.
Flex includes a default configuration file named flex-config.xml.
This configuration file contains most of the default compiler settings
for the application and component compilers. You can customize this
file or create your own custom configuration file.
Flex SDK includes the flex-config.xml file in the flex_install_dir/frameworks directory.
The Flash Builder compilers do not use a flex-config.xml file
by default. The default settings are stored internally. You can,
however, create a custom configuration file and pass it to the Flash
Builder compilers by using the load-config option.
Flash Builder includes a copy of the flex-config.xml file that you
can use as a template for your custom configuration file. This file
located in the flash_builder_install_dir/sdks/sdk_version/frameworks
You can generate a configuration file with the current settings
by using the dump-config option, as the following
mxmlc -dump-config myapp-config.xml