.cda file
A CD Audio Track or .cda file is a small (44 byte) virtual file generated by Microsoft Windows for each audio track on a standard "Red Book" CD-DA format audio CD as defined by the Table Of Contents (TOC) (within the lead-in's [[Compact Disc subcode|subcode e in the format Track##.cda.
The .cda files do not contain the actual PCM sound wave data, but instead tell where on the disc each track starts and stops. If the file is “copied” from the CD-ROM to the computer, it becomes useless, since it is only a shortcut to part of the disc. However, some audio editing and CD creation programs will, from the user's perspective, load .cda files as though they are actual audio data files. Although when you copy it is useless, you can click on the file when you're in the disc file area and it will play in WMP (Windows Media Player).
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