Apps and files

I'm still trying to wrap my head around where files are stored on my tablet.
One insight I learned today is that some applications store data files in their own special database. NoteEverything stores its data in a separate database. This app allows the user to export files as text files to the SD card and also allows importing text files into the NoteEverything database. More info can be found here.
Other apps such as Docs to Go store documents as individual files.