I previoulsy purchaes "Files" and this works exactly the same way, even uses the same IP address as the server. So, I wonder if they will work together, but I don't see how - your computer will connect to the same server port, but not both applications! (guessing, haven't tested it yet)
For those with connection issues on Windows - Firewall settings! I use trend at home and had to set it to a different profile which I guess unblocks the port.
Edit: so it looks like whichever one was running when the computer is set up is the one the computer will see. I think this is a great free app, but when it goes on sales, I think Files is the better app. Shows the real icons PDF, Word etc and has more viewing options such as placing a bookmark in a large document.