65.9MB file shows 632MB on Roxio

I have an MP3 file that shows 65.9MB in Windows Explorer and when I drag it to Roxio CD creator it shows 632.75MB. Why? I'm using a CD-RW.


Also, if I have a file that is under the 650MB CD limit but is over 80 minutes recording time limit, would the time limit not allow me to "burn" the file.