My macbook running Lion will not open large jpgs.

my macbook running Lion will not open large jpgs. looks like anything over 3 mb does not get a thumbnail image and when i try to open the file I get the message " It may be damaged or use a file format that Preview doesn’t recognize". smaller files open without any problem. what to do? thanks

It should open. I have jpegs lager and they open. Try launching Preview and opening it from within the command-o window.

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