Basically my cousin just called and said that one of her folders of pictures now is showing as a single file in windows explorer, and when she tries to double click it, the "Open With" dialog is shown up, as if it was an unknown file.
I did find something on Google, but all the answers on the first hit suggested that it was hard disk corruption. Would that be right? Or is there some registry setting that can be changed to make it show as a folder again? Or some other trick?