apm_mobile css file not used on in app browsers

There is a session variable that's set when the user connects It's basically a logic decision based on the combination of the HTTP POST information and User-Agent that begins the connection.

Then there is a PHP switcher for delivering whatever CSS version (/var/sam/www/php_include/webtop/renderer/customization/general_ui/default_general_ui/en/apm.css):

Don't edit that file because your changes will be destroyed on any upgrade.

The logic looks like this:

$name = "apm_full.css";
switch( $_GET["uimode"] ){
    case 7: if( $_GET["cplatform"] == "MacOS" ){ $name = "apm_edge.css"; } break;
    case 9: $name = "apm_mobile.css"; break;
}
include( $name );

"uimode" is set to those numbers depending on a combination of the user agent and any POST data received.