> the NT kernel is not backward compatible at syscall level I don't think they officially guarantee it, but would you mind elaborating on this? They change the

> the NT kernel is not backward compatible at syscall level I don't think they officially guarantee it, but would you mind elaborating on this? They change the syscall numbers frequently, which you never ever use on Windows (you reference them by name instead), but any syscall that I've ever used (NtCreateFile, NtQuerySystemInformation, etc.) has been rock solid/stable. What syscalls have you seen broken in the past that users were actually relying on?