I think there is a patch you have to install, forget the name of it. GVP serial or some similar name.
As to CD...
Might be CD / or \. Don't really remember. Experiment.
Or just type the name of the root dir, ie: Work: CD became sort of obsolete around the time of OS2.0. You don't need to use the CD command, you can type boot:system/toys/mytoy to get to that directory without using the CD in front of the path.
