Can not create a NtripleContext on windows

example code

import java.io.File;

import org.tupeloproject.rdf.ntriples.NTriplesContext;

public class NtripleTest {
public static void main(String[] args)

{ new NTriplesContext(new File("C:\\context.nt")); }

}

exception:
Exception in thread "main" java.lang.IllegalArgumentException: illegal pathname
at org.tupeloproject.kernel.impl.SimpleFileContextUriMapping.map(SimpleFileContextUriMapping.java:54)
at org.tupeloproject.rdf.ntriples.NTriplesContextFacade.<init>(NTriplesContextFacade.java:55)
at org.tupeloproject.rdf.ntriples.NTriplesContext.<init>(NTriplesContext.java:131)
at NtripleTest.main(NtripleTest.java:7)