How to override module?

Hello,

I'm trying to modify the output of mod_communityanswers/tmpl/most_popular.php. I've copied that file to templates/mytemplate/html/mod_communityanswers but that doesn't seem to work. Also tried templates/mytemplate/html/mod_communityanswers/tmpl as the destination, but that doesn't work either. Shouldn't I be able to override this module using the normal methods?

Thank You,
CJ