Automatic file replacement in XYwin

[Paul Breeze paul.breeze@xxxxxxxx]

Sometimes when I am being particularly clumsy on my keyboard I manage to press a key combination which causes the current file which I am editing to be replaced by an earlier version of the same file. I have no idea what combination of keys I press or what the function is which I activate. Can anybody tell me, so that I can find and remove it from my keyboard.

Thanks

Paul