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Next, click on OK and then enter the following Machine specific formula (thank you to Alex Marocchi from Leitstelle Tirol for the SetOnce tip on Sep 26, 2019!):
@if(@lowercase(@left(@platform;3))="mac";
"EXTMGR_ADDINS=libpmc.dylib: SetOnce";
@lowercase(@left(@platform;3))="win";
"EXTMGR_ADDINS=pmc.dll: SetOnce";"")
Save and close the policy document.
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