I have one Excel file that has suddenly started very strange behaviour. When I open it in Excel, it loads two copies into memory and uniquely identifies them by appending a colon and then a number. For example, if the file name was myfile.xls, when it is opened it creates myfile.xls:1 and myfile.xls:2 in Excel. If one makes changes to one copy, they are simultaneously done in the other copy!!
What on earth would have caused this psychotic behaviour? It only happened to one file and it happened all of a sudden.
Drew