Director to other format. Im afraid is hard to do because of the complicity of Director.
Suggestion:
1. Redo your stuffs in Flash. It will be very small there.
2. Try reduce the cast size in director. convert images to 72 dpi and use simple images. I manage to reduce the size of a director file this way last time. I found out my cast are actually too big in size. Reduce them and import them using the import button rather than cut and paste into the cast.

Happy trying!