mod_virtuemart_category/tmpl/all.php
mod_virtuemart_category/tmpl/current.php
mod_virtuemart_category/tmpl/default.php
at the top of the file there is
JHTML::stylesheet ( 'menucss.css', 'modules/mod_virtuemart_category/css/', false );
BUT, its not added. There is not even a folder /css in the module