Netbios.sys – Pre Service Pack 2 Revision History for Windows 7 SP1, Windows Server 2008 R2 SP1 and Windows Small Business Server 2011 (SBS 2011)

08-Mar-2012 – 6.1.7601.21938 – Netbios.sys – x64 – http://support.microsoft.com/kb/2668395 – 32-bit NetBIOS-based application stops responding in an x64-based version of Windows 7 or of Windows Server 2008 R2

08-Mar-2012 – 6.1.7601.17792 – Netbios.sys – x64 – http://support.microsoft.com/kb/2668395 – 32-bit NetBIOS-based application stops responding in an x64-based version of Windows 7 or of Windows Server 2008 R2

24-Nov-2011 – 6.1.7601.21866 – Netbios.sys – x64 – http://support.microsoft.com/kb/2633667 – 32-bit NetBIOS applications cannot receive connection close notifications in a 64-bit version of Windows 7 or in Windows Server 2008 R2