CDA files aren't actual files. You need to copy(rip) the files from the cd to your hdd.

These sites should help explain it:

Compact Disc Audio track - Wikipedia, the free encyclopedia

How to Work With Audio CD .CDA Files

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If it ain't broke, fix it till it is!

Thanks for your reply but I don't think you understand me. The files I download from Limewire are mostly mp3 files All I want to do is keep the real title in the cda that I burn to a CD. For example I want "Fly Me To the Moon.cda" instead of "1.cda" etc.