I don't know about the core files, but there are plenty of alternatives:
http://www.google.com/search?q=cart+buttons

Rob

Hi Michael,

The psd is located inside ...\\DesktopModules\Store\Templates\Images\Bouttons.psd. Boutons is buttons in French, sorry I forgot to translate the file name. The font used is Cambria available for free at the Microsoft web site.

Gilles

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We (team members) are Humans offering their knowledge, their work and their spare time FOR FREE to benefit the community. It would be so particularly appreciated that your messages begin with "Hello" and end with "Thank you" or any other form of politeness. Ask yourself what your reaction would be, if you were approached by me (a total stranger) on the street to ask you something without saying "Hello" nor "Thank you"? After several years of services dedicated to the community, I begin to be tired to read requests without any form of politeness.