you don't have the right codec to decode the selected file. missin' codec: mac II is converter and audio-grabber which allows you to convert from mp3, mp2, wma, aiff, amr, ogg, flac, ape, cue, ac3, wv, mpc, mid, cue ,tta, tak, wav, wav(rf64), dts, m4a, m4b, mp4, ra, rm, aac, avi, mpg, vob, mkv, mka, flv, swf, mov, ofr, wmv, divx, m4v, spx, 3gp, 3g2, m2v, m4v, ts, m2ts, adts, shn, tak, xm, mod, s3m, it, mtm, umx, mlp to m4a, alac, ape, flac, mp3, mp4 (using NeroAAC), ogg, raw, wav, wav(rf64), wma, WavPack, mpc, mp2, Speex, ofr, ac3, aiff, tak, snd, Shorten and Opus formats. Command Line parameters are supported (see Command Line ). Best .ape to mp3 converter basic explanation convert ape to .mp3 Free APE to MP3 Converter is very to use. Simply add the audio files to convert, select the target audio format and quality profile and then press the "Convert" button.