I have seen this error message now several times when an image from my
Minolta DiMage X digital camera is somehow damaged:

"Could not open (name of file) because a SOFn, DQT, or DHT JPEG marker
is missing before a JPEG SOS marker"

The files show in Photoshop Elements' File Browser as a JPEG icon with
its correct file name, but are not converted into thumbnails as are the
other pictures that are not damaged. GraphicConverter cannot open them

Any suggestions on how to fix these files? With a text editor, or