I'm thinking that you're not asking this question correctly,or I'm not understanding it.
Do you want to reopen a cakewalk file(.cwp,bundle etc.) or a simple stereo mixdown wave file?
The CDRW part is what has me puzzled.Cakewalk in itself has no CDburning capabilities,all archiving,burning must be done in a different program.
Please give us more details on what exactly you would like to do.