Custom extension

Yes, I’ve looked in the forums and I checked the MM site, but I can’t find this.

Let’s say I have a Flash App which contains certain information. Eg: an addressbook.
Is it possible to create a new entry (using XML) and to save this entry on the server (or harddrive) using a custom extention (eg: fab //flash address book)?

If anyone knows how to do this, it would be greatly appreciated.

-=W=-