Windows projector file extension?

I would like to know what the file extion for a windows projector file when published. I realise that when published normally, flash publishes an SWF file. I will explain why I need to know.

I have a movie that has buttons, when pressed the buttons load in external SWF files into empty movie clips. This does not work with the windows projector files, so I need to know what they are called. I have looked in their properties but can’t see the info there.

Thank you.