Thanks for your reply and apologies for being slow - ive been out of the office.
My version is 2016 Deluxe 64 bit v23.2 Build 61.2
It suggests (from the save as) the following are options 2013/2016, 2010/2-12, 2004/2006, 2007/2008, 2000, R14.
I have tried 2013, 2010 and 2007 so far on a couple of different files...
Hope that helps! thanks again.