Being a Microsoft product, Windows 8, 8.1 or RT 8.1 can be used to add music and videos to Xbox Video and Xbox Music. Also Xbox Games can be enjoyed on Windows 8 and Windows RT. It is not limited to only Music or videos but various Xbox feature like leaderboards, multiplayer modes and connecting with friends. Here is a guide to add videos and music to Xbox Video and Xbox Music on Windows 8, 8.1 or RT 8.1.
For the videos which are stored externally e.g. USB drive, add folder directly to the library. The videos which are on a network or network access storage (NAS) drive, your network share must be hosted by Windows operating systems. Also there should be Windows Search and Desktop Experience installed and you must enable Indexing. After these things are in place rebuild the index to get network shares function correctly with the Video app.
To remove a music folder when using Windows 8.1, click "X" from upper-right corner of the folder tile, then select Remove Folder to confirm removal. You cannot remove all the folders as the app wont work with an empty library.
For the music which is stored externally e.g. USB drive, add folder directly to the library. The music which is on a network or network access storage (NAS) drive, your network share must be hosted by Windows operating systems. Also there should be Windows Search and Desktop Experience installed and you must enable Indexing. After these things are in place rebuild the index to get network shares function correctly with the Music app.