Inconsistent Shell Context Menu

I noticed something peculiar this morning. The Explorer right-click context menu is inconsistent on what it displays.

For example, when I right-clicked on one folder, it displays the "Add to Windows Media Player List" and "Play with Windows Media Player" options.



However, when I right-clicked on another folder, these options are absent.



Whether these options appear in the context menu seems to be entirely arbitrary. About half of the folders have the options, and the rest do not.

Is this a known bug?

Not sure if it's a bug but I have to open the folder and then the options to play the media shows up..