I'm on a Mac machine and I'm used with this matter and/or confusion.
.m4a is the successor of .mp3 and at the same bitrate is a much better compression lossy codec.
Now, speaking of lossless, the Apple Lossless Audio Codec (ALAC), which is comparable to FLAC or APE, just uses the same extension of that (modern) lossy audio codec: .m4a
This is where the confusion arises.
The files Joelfan kindly shared are undoubtedly fake lossless. They "say" they're ALAC compressed (obviously with .m4a extension), but they're not lossless.
They look to me as 128kbps mp3, then upscaled to 16-48 lossless ALAC.
I hope I've shed some light on the topic, even if we've discussed this already in the past.
Anyways, here is a legit lossless AMPS 119 for those interested.
Enjoy.
swisstransfer.com/d/05a7e2c9-e85b-4a24-8e9c-85371521533e