rename them .yourEvilName.vid

its all about the . in the beginning....

to make them visible agin you would have to change visibility settings in your file browser(dont know how) or use firefox to browse your data or use xterm to rename them if you want them visible.....

quick thought thou: why not in a seperate folder?

EDIT: the whole . thing obviously only works if . files are set to be not visible in the beginning...