Windows Media Player 10 problem

Something has changed in WMP10 and I'm not sure how it happened or how to fix it. When i open a folder that I have a CD in, and right click in that folder, among the options is "Arrange Icons By" but under that I no longer see "Album" which would let me put them in order as they appear on the CD. I see "Name, Type, Size, and Modified." Should I just uninstall and reinstall WMP 10 and see if that fixes it?
Also, I have a couple of CD folders saved on my desktop that I have burned. the file name has changed from .wma to .wml What is .wml? They play fine but I just don't know what that is or how it changed. For example one of them is called "Rock CD Burn.wml" and used to be "Rock CD Burn.wma" Any help would be appreciated. Thanks.