The project '%s' has been modified outside the environment, and there are unsaved changes to the project. Press Save As to ...

The project '%s' has been modified outside the environment, and there are unsaved changes to the project.

Press Save As to save the unsaved changes and load the updated project from disk.
Press Discard to discard the unsaved changes and load the updated project from disk.
Press Overwrite to overwrite the external changes with your changes.
Press Ignore to ignore the external changes. Your changes may be lost if you close and reopen the project.