In the file http://downloads.jboss.org/modeshape/2.1.0.Final/modeshape-2.1.0.Final-all-with-dependencies.jar, final JAR files in modeshape-*-with-dependencies.jar files are misnamed, e.g. modeshape-connector-filesystem-2.1.0.Final-tests.jar instead of proper modeshape-connector-filesystem-2.1.0.Final.jar
The content of the file is OK, i.e. it contains the proper connector classes, not test classes.