I believe I have corrupted NEF files, they are only showing the NEF icon and won’t open in Bridge, Lightroom, or Photoshop.
 
	The files are about 30-50mb in size.
 
	They are old photos from a holiday (specifically two holidays) so not still on cards unfortunately. I do have them printed into family photobooks so have a tangible record but I was wondering if there is any advice on recovering corrupted NEF files? 
 
	I was in the process of finally sitting down to sort out back ups, which has obviously hit home the message that I need to sort myself out!