This
dialog displays the selected file's module depencies and grants you the
ability to add these modules in the package.
Additionally you have the option to display the system modules depencies by selecting the “Show system modules”option.
Dependencies which cannot be accessed (for example assemblies in the
GAC) can only be displayed (a checkbox is not showed next to them). If
you want to add them to your project you can add the package which
installs them as a prerequisite or you can add them from another
location.