Thanks !
Been able to change the icon here :
C:\Users\User\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar
But don't understand why also files (.ink, .ink) here (changing icon here as no effect) :
C:\Users\User\AppData\Roaming\Stardock\Start11_Pins
On Regedit, under : Computer\HKEY_USERS\...\Software\Stardock\Start8\Start8.ini\Start8\TaskbarAppIDCache
I changer the key value from :
"@FAAfWA0aLPAhvlBDiLBzZ/yW7zy3AAAAsQC7r5M7owAEAAAAAAAtAAAAMVNQU3ND
5Qq+Q61PheRp3IYzmG4RAAAACwAAAAALAAAA//8AAAAAAABFAAAAMVNQUzDxJbfv
RxoQpfECYIye66wpAAAACgAAAAAfAAAADAAAAEQAaQBzAGsAcwB0AGEAdABpAG8A
bgAAAAAAAAAtAAAAMVNQUzqkvd6zN4NDkedEmNoplasRAAAAAwAAAAATAAAAAAAA
AAAAAAAAAAAAAAA="
To : Microsoft.AutoGenerated.{5B4C4CCC-6731-9577-B0AB-C2A4B52FCDD4}
And now the target is fine :

And more important, the "Pinned taskbar shortcuts control" doesn't hang anymore.

And I also have the possibility to open properties that was missing until now.
Before :

Now :

So something to fix when we link network devices.