Ah ha - that's cracked it. It is the simple things that get you !!!!
For the benefit of others, my file is in the c:/wamp/www directory but I was trying to launch it from the Wampserver www.directory menu. I was confused because htm, html files open up from here just fine. Also ini and conf files in the other directories.
I just wished I had asked a week and a half ago !!
many thanks Ste
Forum:
WampServer English