Do you mean you have a proper webserver set up?
You would be way better off just using webrequests and possibly Json to read the data properly. I am not sure why you are doing file stuff at all. I am assuming the files are on a different machine, so reading a file with a path will most likely fail anyway.
Here is a nice and short tutorial on how to set up WebRequests with Unreal Engine. It pretty much covers what you need to requests the file as string and then parse it into a JsonObject.