Novell ZENworks 10 Configuration Management with Support Pack 1 - 10.1 ZENworks Control Center - ZCC
In the Deployable Devices list within the ZENworks Control Center it is not possible to edit the Operating System filter.
This filter is populated with a coded list of known platforms. It is not possible for a customer to list all "windows*" machines.
This is fixed in version 10.2 - see KB 7003225 "ZENworks Configuration Management SP2 (10.2) - update information and list of fixes" which can be found at https://www.novell.com/support
The filter supports "*" and "?" searches.