Here is the Telnet client from Win 2K Pro. It behaves properly when connecting to BBSs. The one that ships with XP has a problem because it echoes locally typed characters. Win 7 and later seem to have no telnet installed by default. This one should work for you.
Extract these files to c:\windows\system32.
TELNET.ZIP 40.66KB 76 downloads
Edit: Make sure to cancel any and all Windows File Protection dialogs when you replace the files.
Edited by Kyle22, Tue Apr 25, 2017 6:56 PM.