The front page for Picard reads in part,“Multiple Formats: Picard supports all popular music formats, including MP3, FLAC, OGG, M4A, WMA, WAV, and more”.
edit: I found the Picard FAQ which includes What formats does Picard support? Picard supports MP3, Ogg Vorbis, FLAC, MP4 (AAC), Musepack, WavPack, Speex, The True Audio and Windows Media Audio.
I now understand ape files are not supported.
Ape files are supported (and has been as long as I know Picard). If you open Help > About you will see a list of file types Picard can load.
Ape is especially important, as it has it’s own tag format, which is used by some other audio formats as well (e.g. WavPack). See also the tag mapping
I don’t know why this FAQ entry is so limited, but it shows not all supported formats. Apart from Ape there are also at least OptimFROG, TAK and Opus missing.
I have installed Picard Version 1.4.2
"About" page reads in part:
aiff, aif, aifc, mp3, mp2, m2a, tta, mpc, mp+, wv, ofr, ofs, ape, tak, flac, oggflac, spx, ogg, opus, oga, ogv, m4a, m4b, m4p, m4v, mp4, wma, wmv, asf, wav
I created https://tickets.metabrainz.org/browse/PW-60 for this
Please note that this reports the supported file extension, as opposed to actual audio file formats. So e.g. m4a, m4b, m4p, m4v, mp4 are all possible file extensions for MP4 files.
Fyi, although the lists of supported file formats at the English and Spanish Wikipedias correctly list APE support, but they have not yet been updated for Picard v1.4.2, and so are missing some formats.