The documentation included states this is a Beta 3 release of Windows 2000 DDK from April 1999 and should only be used on a build of Windows 2000 Beta 3 from April 1999. The only leaked build from April 1999 is build 2031.1, so I assume the version number is either that or something else between 2000.3 (December 1998) and 2072.1 (June 1999).
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