Instant CD Wizard 6 - why can't I drag and drop?

When using ICDW 6 for the first time, I was pleased at how quick it did a cd-copy, but when i went to make up an audio of MP3 wavs it gave me a box to find each individual track which is a lunatic and slow idea, and when i tried to drag and drop it said the .wav files were an unknown format ? I must surely be doing something wrong because as it stands that is the worst way to make up a cd of any of the progs. Can anyone put me straight on this ?:rolleyes: