WMA files are a type of computer audio file designed mainly to be played using Microsoft’s Windows Media Player. Normally, car stereos can only play CDs with songs in the audio CDA file format. Certain car stereos, however, are also capable of playing CDs filled with these WMA files. If you want to play these audio files in your car stereo, you’ll have to use a CD burner and blank CD to burn up to 700 MB, or about 80 minutes, of these files to a disc. Writer Bio