You need to work out how to set the JVM's language under Windows. One property is file.encoding but this [should] only affect file I/O, but google threw up this snippet:
"By setting the (Windows) environment variable JAVA_TOOL_OPTIONS to -Dfile.encoding=UTF8, the (Java) System property will be set automatically every time a JVM is started. You will know that the parameter has been picked up because a message will be posted to System.err."
So try that and see how you go.
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