I want to delete the team project file.

Hi,

The owner of the Team Project can remove the Team Project in the 'Manage Team Projects' dialog (File > Open Team project...).
Just select the Team Project you want to remove and click the 'Archive' button. At this point the Project will no longer show in the Media Browser, but it can still be restored. If you want to delete the project permanently, select the Team Project in Archive tab and click 'Delete...'

Best,
Udo