Last version of RDP that runs on XP/XP64 is 6.1.7600.21448. Patches for latest versions: Code: XP deepxw termsrv.dll 5.1.2600.5815 @22e37 74 -> 75 @22eb2 7F 16 -> 90 90 Code: XP64 daNIL winlogon.exe 5.2.3790.4516 @42104 48 81 EC 58 01 00 00 -> 31 C0 C3 00 00 00 00 @43ca7 74 -> EB termsrv.dll 5.2.3790.4676 @746b 0F 94 C1 -> FF C1 90 @195CB 75 -> EB @1A24E 74 -> EB Code: x86 mstscax.dll 6.1.7600.21448 @17f2f0 7F 00 00 01 -> FF FF FF FF ------------------------------------- x64 mstscax.dll 6.1.7600.21448 @1d1c94 7F 00 00 01 -> FF FF FF FF mstscax.dll 6.1.7600.21448 wow64 @17f2f0 7F 00 00 01 -> FF FF FF FF Code: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server] "fDenyTSConnections"=dword:00000000 "fSingleSessionPerUser"=dword:00000000 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core] "EnableConcurrentSessions"=dword:00000001 [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] "EnableConcurrentSessions"=dword:00000001 "AllowMultipleTSSessions"=dword:00000001 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services] "MaxInstanceCount"=dword:00000005