First, you could put your project in a .net wrapper and use
the externalinterface class to pass the data to the wrapper, and
save it there. Its tedious, but ultimately not THAT difficult.
A different option would be to grab a copy of uniserver
(free, small, very simple to use), start it up, and pass the info
to a PHP script via sendAndLoad or remoting, and save it there.
If you have any .NET experience, that will probably be the
easiest route. If not, setting up a local PHP server with Uniserver
is really very very easy (you don't even install anything, just
download it and run it), and finding a php script to save a file
would only take a few seconds of effort.
If you have any questions about either of these options, let
me know. :)