Windows NT 3.5 build 807

Windows NT 3.5 build 807.1 is the RTM of Windows NT 3.5.

The Compaq document "Migrating from Microsoft Windows NT Advanced Server 3.1 to Microsoft Windows NT Server 3.5" references a Compaq OEM version of the Server SKU, dated 1994-11. According to page 15 (contrasted with page 28 referencing non-OEM media and Setup Boot disks), the Compaq OEM version is a bootable CD; if so, not only would it be one of the first bootable CDs, as the El Torito specification was released in 1994-11 along with the first BIOSes supporting it, but it would also predate Microsoft's implementation of the same (in Windows NT 4.0) by over a year. As of 2020-03, the Compaq OEM version remains undumped.