How to enable Alt Gr or Alt keys on a Telnet Server

Question

I'm running a telnet server KpyM on a Windows Server 2008. My telnet client is a Putty on my Windows 10 computer.

I'm running a 16-bit DOS Application through telnet.

I need to use the "\" on an AZERTY keyboard. There are two ways to have it : Alt Gr + 8 or Alt + 92.

Here is what I have:

Here is what I want:

This depends on my telnet server, for example when I use the Telnet Server from Windows, it gives me "_ _ _ _ "

How to fix this? On my KTS folder, there are some interesting files like : utf-8.ini telnet.ini kts.ini

---

EDIT:

Referring to this post : MS-DOS 6.22 keyboard configuration

I've changed my autoexec.nt file and config.nt , but Alt Gr + 8 is still non-existant. Indeed, it sets the keyboard in FR as I want.

• autoexec.nt :

Mode con cp prep=((850 863) C:\Windows\System32\ega.cpi)
Mode con cp select=850
KB16 fr,850,C:\Windows\System32\keyboard.sys

• config.nt :

dos=high, umb
Country=002,850,C:\Windows\System32\country.sys
device=%SystemRoot%\system32\display.sys con=(ega,850,2)
files=40