Problems and questions regarding CD-R-Disk

If a tag was built with an apparent meaning but afterwards started meaning something else, what should be done?? For instance, .cdr tag was built as a CorelDraw file ext, but afterwards it was utilized as a CD-R-Disc by 2 users . Correct me if I am wrong, but I imagine that the solution is to create a cd-r tag, then retag 2 queries, and afterwards add tag descriptions for both. What I am not confident about is, if a tag started meaning something else, does it replace the 1st one?
