tobias,
Yes it is true. Plex generated C++ including WinC and WinNTC doesn't support Unicode in program layer.
However it is supported with both Client and server of Java, and .NET. Also RPGIV on IBM i.
The data exchanges between Java <--> .NET, Java <--> RPGIV and .NET <--> RPGIV is also supported.
If you use C++ allocation as a Client to connect these 3 platform, it keeps runs however all of Unicode Data will be converted to non-Unicode data (ANSI) therefore you will see a loos of Data.
So if you build WINC Client to connect C# Server, it isn't pure Unicode supported environment.
HTH,
Kiyoshi