Important: WebXtra sprites do not spawn a working web browser on the Macintosh: the Xtra is only fully functional on Windows. The Macintosh versions of the Xtra are provided as stubs to help users that must author cross-platform movies on the Mac platform, or need to work in both platforms with the same set of files and cast libraries, without any error messages. With these stub Xtras it is perfectly possible to write a complete application using WebXtra on the Mac and cross publish it for Windows using Director 11 and MX 2004.