I am unable to view a series of .jpg files. They show on
the file icon and in the e-mail they came in, but when I
click on them they are blank. I’ve tried repairing
permissions and that doesn’t see to work.
Solved Can’t View JPG File On MAC
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The Finder will ask you something like “Would you like to Add the JPG file extension to this file”, choose Add.
Also you could select the file and choose “get info” and expand “Name & Extension”. It should have a file format if not add one.