June 15th, 2013, 07:51 AM
(I wish I could explain this more clearly.)
Your file (.jpg, .png, .bmp, .gif, .bmp, .doc, .txt, etc., etc.) is whatever it is.
The icon for a particular file may not necessarily reflect what the file actually is.
If there is no custom icon, or the system for some reason doesn't know what the icon is, it will display a generic icon, determined by the file's type.
That guess is incorrect. The icon displayed is a generic icon used by the system to show (in this case) a .jpeg file, and is NOT the same as the Preview's app icon.
A .tiff or a .png file will NOT have the letters JPEG, but...