Ta 4 that. But have to apologise for wasting your time 'cos have managed to Alt Tab the sucker out of the tent after all (only realised how that worked after last email). And, as you say, the rat is small potatoes.

However since it's happened twice may well happen again since I alt tab a lot. Assume hex editing not beyond me as used to be analyst/programmer in my dim & distant past. But not a clue at present - do I need particular software 'cos stuff on my PC doesn't recognise *.000? No big one if you don't have time to answer this, just curious for future.

Thanks again
Muriel