CDA files don't actually contain the music file they are just 44 byte shortcuts to the music created by Windows. To create CDA's you will need to encode your music files as 16-bit PCM streams (uncompressed 44 100 Hz 16 bit stereo audio - the commercial standard).... CDA files, which stand for Compact Disc Audio files, are virtual files that represent data in a CD. If you see the contents of a CD on Windows, you will notice a number of .cda files such that each file corresponds to a single soundtrack.