Here's what has just happened.
I opened the file C:\Meade Images\Darks and the darks are in there, but there are 13 of them and they won't open!!!
I named them 'Darks 2 deg 1 min' but in the file they are named from 'DSI 1 Dark 00 01.0_' thru the 13 of them to 'DSI 1 Dark 00 60.0_'
And each one is 976kb !
It says in properties that they open in Photoshop, but they don't. A window pops up in Photoshop saying 'This file cannot open, wrong type of file'.
I have also taken 2 more sets of darks and they aren't even in there at all
