The record for the VerifyVersionInfo function was moved to WIN32.LIB in C10. Earlier it was in Win32Ext.LIB. Sounds, you need to update your WIN32.LIB accessed by redirection.
I’ll check the redir file out as C11 was installed from scratch on a new machine, so there’s nothing I could change or mess up unless it was messed up in the C6 app.