Yes, if you did a quick erase, it's still possible to still recover the files - however, I do not know an application that does that for you. You could send the CD-RW to a data recue service or google for an application that can recover files from deleted CD-RWs. If it's a hybrid CD (e.g. created with the Finder), you could also use a Windows PC to recover the files if you find a Windows application but no Mac application.