dkresz:
Also, you may find that Apple Lossless audio files played on Windows-based software (i.e. the BeoPlayer / BeoSound media player software loaded on the BeoMaster) have a slightly inferior sound quality than the supported lossless formats (i.e. WMA Lossless). Try a compare of the same sound clip in the two different formats.
That's simply not true unless something is amiss with, say, the plugin.
Both are converted to uncompressed PCM on-the-fly when playing, so if it's installed properly and it's not buggy, there will be no difference whatsoever. They will be the exact same bit for bit and thus also sound exactly the same.
Edit:
Wave and aiff are just containers for the PCM - the raw audio data. The difference is "Little endian" and "Big endian", which merely means that one has the information bit last in the "word", and the other having it at the beginning of the word. Both "formats" (containers) carry the exact same information as does the lossless compression schemes such as FLAC, ALAC, WMA Lossless, and what have you. There is no difference in the resulting PCM, the resulting audio. Any difference you hear is imaginary.
/end edit