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You mean extension = new compute.VirtualMachineExtension(     "extensiontest",     resource_group_name=resource_group.name,     auto_upgrade_minor_version=False,     enable_automatic_upgrade=False,     type="CustomScriptExtension",     type_handler_version="2.0",     force_update_tag=False,     publisher="KBC",     settings={         "commandToExecute" : "mkdir c:\eric"         },     vm_name=vm_TestVM.name     )

For C# I could see that maybe working. This is using Python. Have to admit I breathed a sigh of relief it wasn't that easy 😀