The problem for me was the setting for the file within the QlikView Manager...
go to the User Documents tab/section
click on your file
on the right side of the screen, choose the Authorization tab
Here you can either enter a list of users who will be able to access the file, or you can allow anyone access (anonymous). For Anonymous you need to click the "+" icon, then click the pencil icon to bring up the screen of access rights. Here you get the "Anonymous" option as a tickbox - tick this (and save it and apply it) and any user with access to the server will be able to access this file.
Hope this helps,