Adding files to Rewriteable CD??? in ImgBurn Support Posted September 15, 2008 You could temporarily copy the files from the disc to a folder on your desktop and then add the files to burn to this folder. Then just burn to the disc with Imgburn (it will prompt to erase the disc first). Thanks Peru but I found a freeware app that seems to do just what I want, called CDBurnerXP. It allows me to create "Open session" data discs, and then when such CD-RW is re-inserted to my drive, it asks if I want to add to the existing session. Looks like a winner so far.