Thanks for the reply.
I could do that but I want the service opened directly in the map I'm using.
I'm adding a topo map service using the .nmf files from the services.arcgisonline.com repository. I use the "add content" and in past versions, 900 specifically, there was an "all files" option in the file type drop down list, which is now gone.
There is an easy work around however.
I could add the service through the add services option but the guys looking at my tutorial are computer challenged and adding the topo service in a similar way to adding layers makes it easy for them.