Thanks, tsantee, for your suggestions. I followed your instructions and indeed my .sd2f files are recognized by Toast and the tracks can be played by those methods. However, my real goal was to be able to mount them as virtual CDs so that iTunes can import them, which is what I was able to do with Toast 8. Having explored Toast 11.1 a bit more since my first post, I found something else about this that makes this situation even more puzzling. I found that Toast 11.1 still enables you to create an .sd2f image file from a CD ("Save As Disc Image" command-D), but won't turn around and mount what it just created. It also provides the option to "Save As Bin/Cue…" but it won't mount images created by that technique either. Why would it create image files it doesn't support? Granted, it will play the tracks from those files by the technique you described, but the "Mount Disc Image" utility command won't mount them. I'm wondering what type of disc images that command will mount? The Toast Help document does describe "Mounting Disc Images" but doesn't say what types of image files it will mount.