In XFCE4, there is a list of items to be started when an XFCE4-session is started
(XFCE4 Settings xfce4-settings-manager → Tab "Application Autostart"):

I'm wondering where this list is stored.
In ~/.config/autostart I have three .desktop files, which are available in the aforementioned list, but there are many more items in that list than those three files.
I was wondering if those items are stored somewhere in a human readable file, or perhaps directory structure.
Although I'm not exactly planning to edit those items via scripting, it would help if it was at all possible to modify that list while a session is not active. For instance should I want to edit those items over SSH, while no one is logged in.