archivo de excel

Try adding .xlsm with https://www.ads-software.com/plugins/wp-extra-file-types/ or one of these plugins: https://www.ads-software.com/plugins/search/mime+type/

The do your own custom code solution would be something like this (untested):

function my_added_mime_types( $mimes ) {
        $mimes['xlsm'] = 'application/vnd.ms-excel.sheet.macroEnabled.12';
        return $mimes;
}
add_filter( 'upload_mimes', 'my_added_mime_types' );

Essentially what one of the previously mentioned plugins would do for you.

gracias, funciono con la primera opción.