Offsetof

Windows kernel and driver structures: their size and every field offset, across every Windows build from XP to Windows 11.

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Layouts come from Microsoft's public symbol files. Builds up to Windows 11 25H2 RTM use the Vergilius Project kernels-data (MIT); the newest update of every Windows 10 and 11 release, plus ntdll and the drivers, are read straight from Microsoft's symbol server, with versions found through Winbindex. Offsets are in hex.