daileycon on "[Plugin: WooCommerce - excelling eCommerce] What file holds theme version number?"

This might be a newb question but I have been wondering for some time. When I update my theme I like to only transfer (replace) the effected changed files instead of re-installing the whole theme. This way I don't have to go edit all my custom changes. But in my dashboard the version number doesn't change. What file holds the version number? Where does the dashboard get the theme version number from?
I hope someone understands what I'm doing and wondering.
Thanks

http://wordpress.org/extend/plugins/woocommerce/