saving and opening files from a bmax app

I'm making an editor which should be able to save and load files. Now it's not too hard to make a function that opens and saves files in one folder only, but it starts to be quite tedious to do a complete (and possibly prety) interface to browse among various folders.

Is there any module ready that does this? Has anybody already written bmax code that does this? is it possible to do the appropriate win / mac calls to open the "standard" interface for openng-saving files? How?

Thanks,

Matteo