What do you mean by the last sentence? Why would you use document files?
MC stores tags like [Artist], [Album], [Track #], [Name], [Year] and [Genre] inside the mp3 or flac music file. Therefore it does not matter what you name the file because when you import it MC will extract the tags from inside the file. For document files, like txt and mht, it is not possible to save tags inside the file. Therefore if you import a document file, and you do not want to have to manually re-enter all the tags, the tags must be stored somehow in the folder or file name. Then using MC's powerful feature for extracting tags from folder and file names you can re-populate the tags. In my case I frequently save text information about albums, such as reviews, with the music files.
Actually this is another of my questions here at the forum. What folder do I have to backup to another
(safe) drive? Is it OK if I save User\Captor\Appdata\Roaming\JRiver\MediaCenter16\Library backups?
Do I have everything then in case of computer theft or house burning down or whatever?
Or should I backup more? Maybe the MediaCenter 16 folder or the JRiver Folder?
Is there something more I should backup (except the media file folder of course) to be home free?
MC nows saves most of its settings inside the library backup file. So if you make a copy of the library backup (plus of course your media files) onto another drive then you will be in good shape to recover from a disaster. MC automatically makes backups once a day or so of its library (not your media files) however I choose to make manual backups on top of this into a different backup directory. I make my manual backups at strategic times such as prior to making a major reorganization to my library, or prior to upgrading MC.
There are a few less important things not saved in the library backup, such as language file customizations and cover art. If you want to be able to recover absolutely everything then you should backup both the program files and the application data folders. Most people can safely skip this step however.