Thanks AppleMacster, I have tried all of those. It's a document so I have even tried changing the file extension to see if I can open it in AppleWorks, Word or even Pages but it is not interested.
I have asked the sender to re-send it to me in a non-.tif format, but it's the first document I have had in years that I have been unable to open and I am intrigued.
Any other ideas?
CC