groovy.bat faile to start script that are in a folder with a dash follow with "s"

to reproduce the bug, do following on Windows XP prompt:

mkdir test-super
echo println(new Date()) > test-super\test.groovy
groovy test-super\test.groovy

I wil get this error:
c:\opt\java_projects>groovy test-super\test.groovy
Caught: java.io.IOException: Invalid argument