Cant change default video app

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http://androidforums.com – Hi. I have an android tablet (zt z102) running 4.0.3. I cant change the default video player from "video player" to something else. It is not listed in the applications list in settings, and yes i have selected the "all" tab. I use File Browser to open my files as i am playing videos of a usb, And there is no option to change default program within it. I can not change the default player from within another player because they all require an sd card to be present. Is there any app that will let me see the video player settings and clear it from the default programs, Or uni (General)