In addition to the above, WMP10 has Folder View, which WMP9 may have too. (I've forgotten - that's how long ago I went to WMP10). You get it by a right-click on "Library" and selecting "Show More Views". That way, as long as the folder is included in your Library, you can browse and play from it directly, which is useful when the ID3 tags in the files are not present and correct.