which static file will be sent when there is same name files in different skins?

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Hi, I have written a custom skin such as "myskin" and updated settings for skins. The template files are loaded correctly from myskin folder, but there is some confusion about static files (which are in media folder). sometimes they are loaded from default skin, sometimes from common skin and sometimes from "myskin". from which folder, static file will be sent when there is same name files in different skins? thanks