FSCommand

Note: exec is not capable of opening a specific file with an application, just the application itself. One way to open files is to use exec to launch a Windows batch (BAT) file or Macintosh AppleScript file that then opens files in the desired application. A third-party tool that can open specific files on Windows without using batch files (no Macintosh version available as of April, 2001) is available from Flashjester.

http://www.macromedia.com/support/flash/ts/documents/fscommand_projectors.htm

/Nikolaj