Local XML Database

I want to make an offline desktop app. that stores my company’s customers and their data in an XML file, just like a database. so that I’m able to load, edit (create new customers, add to their data) and save it into the XML file which is stored locally. i then want to make a Local Connection to the XML file somehow, so that others in the company can do the same from their PC…

Can anybody tell me if this is possible at all? (making a flash app that writes XML files to any location on a PC that only has network… edit XML files through Local connection function in flash). Any suggestions is welcome… thx in advance…