File Name: Look for patterns like en_windows_vista_ultimate_with_sp2_x64_dvd_... followed by an April date code (e.g., apr2011 or 04-10).
SHA-1 Checksum: A true “final” MSDN release often has a known hash. For Vista Ultimate x64 SP2, the standard MSDN hash was F81A4FCDA9E76888C71B268FF54F5FCB12F8E046. An “April Exclusive” would have a different, rarer hash. Verify via community archivist sites like the Internet Archive’s Tech Bench section.
Setup.exe Details: Right-click setup.exe > Properties > Details. The “Modified” date should fall in April of a given year (2009, 2010, or 2011). The “Exclusive” tag often points to April 2010.
EULA Date: During installation, the End User License Agreement should show a copyright date extending to the year of the exclusive build.
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