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/usr/share/cairo-dock/container.desktop is in cairo-dock-data 3.4.1-0ubuntu1.

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#3.4.1

#[gtk-about]
[Desktop Entry]

#F[Icon]
frame_maininfo=

#d+ Name of the container it belongs to:
Container = 

#s[New sub-dock] Sub-dock's name:
Name = New sub-dock

#v
sep_display=

#Y+[Use an image;1;1;Draw sub-dock's content as emblems;0;0;Draw sub-dock's content as stack;0;0;Draw sub-dock's content inside a box;0;0] How to render the icon:
render = 3

#S+ Image's name or path:
Icon=


#X[Extra parameters]
frame_extra =

#n Name of the view used for the sub-dock:
Renderer = 

#i-[0;16] Only show in this specific viewport:
#{If '0' the container will be displayed on every viewport.}
ShowOnViewport = 0

#f[0;100] Order you want for this launcher among the others:
Order=0

Icon Type = 1
Type = Container