tce-load is for loading extension "packages", i.e, additional applications.
The specifications used, are the following:
* Applications can be command line or self starting meaning no menu or no icon.
* Most other applications need at a minimum a menu item so the user booting noicons can access the application. This means at minimum a menu item.
*Otherwise extensions typically consist of both a menu item and an icon item.
You are not making an application extension, but appear to want to have an additional icon for an alread installed application 'aterm'. This does not fit the specifications of an application extension. In order to meet the specs you need a menu item.