The keyword “21H2” cannot legitimately apply to Windows 7. This proves the string is either a typo or a deliberately misleading label.
The file was an "All-in-One" (AIO) monstrosity. It was a digital chimera, stitched together by underground modders to bridge the gap between decades of computing history. The "Windows 7" core remained for the ancient payroll software that refused to run on anything else. The "10 and 11" layers were there for security and modern hardware support. Windows 7 10 11 X64 21H2 PRO OEM ESD en-US APRI...