CDA (CD Audio Track Shortcut)
The CDA Audio file format
CDA files are shortcut files that provide available information to an audio CD that plays the referenced track stated in the file when opened. The CD must be in the CD-ROM format in order to make the shortcut work directly. CDA files don’t contain any actual audio data as the songs are ripped from the audio CD and saved in uncompressed files.
Technical details of CDA files
The CDA files do not contain any PCM sound wave data, but tell the reading device where on the disc each song begins and ends. Generated by Microsoft Windows, the file contains indexing information and is named in the form TRACK # #. CDA