/usr/share/cairo-dock/separator.desktop is in cairo-dock-data 3.4.1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #3.4.1
#[gtk-about]
[Desktop Entry]
#F[Icon]
frame_maininfo=
#d+ Name of the container it belongs to:
Container =
#v
sep_display=
#> Separators' appearance is defined in the global configuration.
Icon=
#X[Extra parameters]
frame_extra =
#f[0;100] Order you want for this launcher among the others:
Order=0
Icon Type = 2
Type = Separator
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