The links to module directories in builds history are created as invalid symlinks with wrong relative path (directory separator "/" is used instead of "\").

23.05.2013  00:10    <SYMLINKD>     my.groupid$my-artifactid [../../modules/my.groupid$my-artifactid/builds/2013-05-23_00-06-06]

This problem seems to be similar to JENKINS-17681 but is not fixed in version 1.515.