OpenVPN Interactive Service Windows working directory not accepted

[nbk01]

When i send a startup Request via namedpipe. I send a Windows working directory i.e. C:\Pedro and the service responds with Startup data ends at working directory. It doesn't matter which directory i send.
I posted some more information in the following topic in the forum ​https://forums.openvpn.net/viewtopic.php?f=24&t=28478

[Selva Nair]

My guess: you may be formatting the string as single byte characters (say, ascii) but the service expects wide characters. That would explain why it sees only one token (the working directory) when the whole string is terminated by two nul bytes or it says no nul termination otherwise.

See ​https://community.openvpn.net/openvpn/wiki/OpenVPNInteractiveService for the specification of startup data.

[nbk01]

Thx, change the encoding to 16 bit utf and it works like a charm