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Originally Posted by DMY
PKZip and RAR are lossless, even Microsoft admits that WMA Lossless is "mathematically" lossless (heh..... see figure 1 in the original article, the screenshot even says it). Yes, I'm aware that "mathematically lossless" is close enough for 99% of the music and people out there... but be aware that there is some music out there that does not pass an inversion comparison test with WMA Lossless, and therefore it's not truely lossless in all cases.
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Do you have some evidence to back this up? Lossless audio compression isn't a new concept and compression rates of 40-60% are quite usual (for listenable music). I highly doubt that MS would screw this up.
Maybe you compared the .wav files on a binary level? Two files can contain the same audio content but differ in their meta information.