Graham, just in case you or anyone else doesn't know all this...
each ZIP archive contains at least one *.eps (encapsulated postscript) image, along with a *.jpg of the same image, and as such will need a program to either import them or open them.
*.eps is better of the two for our use as it can be enlarged or shrunk without loss of quality for printing.
I believe MS Word can import both, but as I don't have Word or Office, I can't test it.
There is a freeware EPS viewer which I haven't tried. It needs MS Net 3.5 installed, which is probably already installed if you keep Windows updated. I don't.
http://epsviewer.org/
Best, in my opinion, is the freeware IrfanView (IView) graphics viewer, which will open both. You also need to download and install the plugins.
http://www.irfanview.com
There's probably other ways to view and print them but as IView works for me, I haven't looked any further.
Martin.