Where is the linux mint panel applets config file?

Question

OS: Linux Mint 18.3 Sylvia
DE: xfce4
I have to set up several PCs and want to write a script which configures the launcher-applets in the panel. So the script would contain in the end something like:
sudo cp ./my-predefined-config-file.type /path/to/location/

Edit:
I figured out that the launchers are saved at the following file-path:
/home/user/.config/xfce4/panel/
However copying a launcher, from another system, into this directory does not make them appear in the panel:
~$ cp -r ~/Desktop/launcher-1/ ~/.config/xfce4/panel/
So there must be still somewhere a config-file which i have to edit in order to make the launcher appear in the panel.

PS:
After changing something I am of course always reloading xfce in order to see the changes:
~$ xfce4-panel -r && xfwm4 --replace

Answer 1

For the record, on my Linux Mint 19.2 with Cinnamon install (not: xfce4 as in the question), the panel launcher config file is at

~/.cinnamon/configs/[email protected]/3.json