Well, I was having no luck with the 64-bit distribution so I decided to go ahead and wipe it out and try the 32-bit and see if that worked. It still didn't work out of the box, so I installed w32codec on the 32-bit system. When I went into xine to set it up to find the new codecs, I found an option that wasn't present under 64-bit: path to win32 codecs. It was even already set for me. Once I put the w32codec files in the directory it pointed to and restarted Amarok, the WMA lossless files played fine. So based on these findings, I think that the 32-bit distribution is the way to go for playing WMA lossless. Even if I had found a w64codec package, there is no corresponding option in the 64-bit version of xine to point to a path to win64 codecs. I only went with the 64-bit distribution in the first place because my computer has 4GB of memory and I can only access about 3.5GB with a 32-bit OS. I don't think it is a really big loss, though, because Linux doesn't tend to be a memory hog.