Huw Davies (@huw) commented about dlls/win32u/win32u.spec:
@ stdcall -syscall NtUserAddClipboardFormatListener(long) @ stub NtUserAddVisualIdentifier @ stub NtUserAlterWindowStyle -@ stub NtUserAssociateInputContext +@ stdcall -syscall NtUserAssociateInputContext(long long long)
This is missing the wow64 thunks.