Hi,
I'm sure this has been suggested before but because there is currently no reliable and safe FTP client available in the Windows Store yet, I'd like to suggest you consider working on bringing FTP connectivity to your app, so developers can connect to their FTP accounts so they can change files live on a server - much like a standard text editor with built-in FTP support. Either this or where we can download and then upload files via a built-in FTP function.
Would be great to know whether this is under development or not. As a motivator, you would sell a lot of copies of your app in the Windows Store because if you incorporate FTP connectivity into your app, more people will likely purchase your app in comparison to others available in the Windows Store.