In the preferences section of iTunes I have it unchecked to "Copy files to iTunes Media folder when adding to library" but not sure why it would add the file.
I have all of my music stored in the default location for iTunes and when I play a file outside of iTunes, it will add it to the library database.
I have all of my music stored in the default location for iTunes and when I play a file outside of iTunes, it will add it to the library database.