Windows NT 3.5 build 622

Windows NT 3.5 build 622.1 is an unleaked build of Windows NT 3.5, mentioned in files  and   from the Windows NT 4.0 source code.

// Revision numbers // //     The first release of NT (NT1.0) didn't explicitly store //     a revision number. However, we are designating that release //     to be revision 0x00010000 (1.0). NT1.0A is being designated //     as revision 0x00010002 (1.2). Previous to build 622 is revision //     0x00010001 (1.1).

// This is the structure used in Daytona through build 622 or so, and // is preserved for backwards compatibility.