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This might help:

Finder>Preferences>Advanced. Uncheck "Show all file extensions"
 

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Finder > Preferences > Advanced...

Uncheck "Show all file extensions"

Individual apps (like Illustrator, etc.) may give you the option of adding the extension again for a particular file. This will override the Finder preference.
 
Finder > Preferences > Advanced...

Uncheck "Show all file extensions"

Individual apps (like Illustrator, etc.) may give you the option of adding the extension again for a particular file. This will override the Finder preference.

It is already unchecked and on my pictures, it says .jpg and .png and such.
 
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