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Bekannte Variablen funktionieren nicht 🙁
Ich werde oft darauf angesprochen, dass die gewohnten Variablen aus der Batchprogrammierung (z.B.: %username%, %computername%, …) in den Group Policy Preferences nicht ziehen. Dies liegt daran, dass es für die GPPs eigene Variablen gibt.

Group Policy Preferences Variablen funktionieren 🙂
Die Variablen der Group Policy Preferences können ganz einfach durch das Drücken der F3 – Taste in einer GPP – Einstellung / Registerkarte angezeigt werden. Durch einen Doppelklick auf die Variable wird diese sofort an der ausgewählten Stelle eingefügt.

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Group Policy Preferences Variablen

%AppDataDir% The current user’s Application Data directory.
%BinaryComputerSid% The SID of the computer in hexadecimal format.
%BinaryUserSid% The SID of the current user in hexadecimal format.
%CommonAppdataDir% The „all users“ Application Data directory.
%CommonDesktopDir% The „all users“ Desktop directory.
%CommonFavoritesDir% The „all users“ Explorer Favorites directory.
%CommonProgramsDir% The „all users“ Programs directory.
%CommonStartMenuDir% The „all users“ Start Menu directory.
%CommonStartUpDir% The „all users“ Startup directory.
%ComputerName% The NetBIOS name of the computer.
%CurrentProcessId% The numeric identity of the main client process.
%CurrentThreadId% The numeric identity of the main client thread.
%DateTime% The current time (UTC).
%DateTimeEx% The current time (UTC) with milliseconds.
%DesktopDir% The current user’s desktop directory.
%DomainName% The domain name or workgroup of the computer.
%FavoritesDir% The current user’s Explorer Favorites directory.
%LastError% The last error code encountered during configuration.
%LastErrorText% The last error code text description.
%LdapComputerSid% The SID of the computer in LDAP escaped binary format.
%LdapUserSid% The SID of the current user in LDAP escaped binary format.
%LocalTime% The current local time.
%LocalTimeEx% The current local time with milliseconds.
%LogonDomain% The domain of the current user.
%LogonServer% The domain controller that authenticated the current user.
%LogonUser% The user name of the current user.
%LogonUserSid% The SID of the current user.
%MacAddress% The first detected MAC address on the computer.
%NetPlacesDir% The current user’s My Network Places directory.
%OsVersion% The operating system: Windows Server® 2008 R2,…
%ProgramFilesDir% The Windows Program Files directory.
%ProgramsDir% The current user’s Programs directory.
%RecentDocumentsDir% The current user’s Recent Documents directory.
%ResultCode% The client’s exit code.
%ResultText% The client’s exit code text description.
%ReversedComputerSid% The SID of the computer in reversed byte order hexadecimal format.
%ReversedUserSid% The SID of the current user in reversed byte order hexadecimal format.
%SendToDir% The current user’s Send to directory.
%StartMenuDir% The current user’s Start Menu directory.
%StartUpDir% The current user’s Startup directory.
%SystemDir% The Windows system directory.
%SystemDrive% The name of the drive from which the operating system is running.
%TempDir% The current user’s Temp directory as determined by Windows API.
%TimeStamp% The time stamp of the configurations being implemented.
%TraceFile% The path/name of the trace file.
%WindowsDir% The Windows directory.

Weitere Quelle
Microsoft Technet:
http://technet.microsoft.com/en-us/library/cc753915.aspx