I'm still using Microsoft Windows NT 4.0 Workstation Service Pack 6a or Windows 2000 Service Pack 2, but extended security update support ended on June 30, 2004. However, this bulletin has a security update for these operating system versions. Why is that?
Windows NT 4.0 Workstation Service Pack 6a and Windows 2000 Service Pack 2 have reached the end of their life cycles as previously documented, and Microsoft extended this support to June 30, 2004. However, the end-of-life for the extended support period occurred very recently. In this case, the majority of the steps that are required to address this vulnerability were completed before June 30, 2004. Therefore, we have decided to release security updates for these operating system versions as part of this security bulletin. We do not anticipate doing this for future vulnerabilities affecting these operating system versions, but we reserve the right to produce updates and to make these updates available when necessary.

So it would be the last patch for NT4 workstations. Be sure to replace or unplug them until the next patch round in August.