If you copy your GroupWise archive onto a CD, it is marked read-only. At present, GroupWise cannot open a read-only archive. You would need to copy it from the CD back into a read-write environment in order to access it.
You set your archive location using Tools > Options > Environment > File Location > Archive Directory. You need to be careful that your archive location is always set to the correct directory where you want ongoing automatic archiving to take place. At present, we do not recommend or support multiple archive locations, although it is possible.