Adding save locations to saveAs dialog

I am trying to achieve the following and I would be really helpful if
someone could tell me
firstly if it is possible and secondly some pointer on how to go about it.

I want to add entries in the Windows drive list box that appears in the save
as dialog box
in Windows applications.

The entry should just appear as either an extra drive or a even better a
parent like the
my computer, neighborhood Network, or Internet Locations (ftp) which I can
add serveral
children to (like the drives under my computer).

I have no real idea where to start and I would be greatful of any help
anyone can give even
if it is pointing me in the right direction

Thanks is advance for any help you can give.