Dear Mats,
technically MWAgent would still work on NT4.
Unfortunetaly we are using a newer Microsoft CRuntime library (MSVC) and other Thirdparty libraries which aren't compatible with NT4 anymore. This also includes the OpenSSL and NET-SNMP library.
The missing API entry "GetSystemDefaultUILanguage" error is actually generated by the Microsoft CRuntime library, or by one of the runtime libraries.
The Agent documentation needs to be corrected here.
I am sorry that I have no better answer right now
The latest Version of MWAgent which runs on Windows NT4 is MonitorWare Agent 3.1 which can still be downloaded from here:
http://www.mwagent.com/en/Download/
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best regards,
Andre Lorbach