Text / Notes to Self - within DVD - Possible?

Well this one ought to be an easier one than some of my others.

Is it possible to put a text file (notepad, with a PC, for example) within the structure of a DVD - and NOT have it impede or interfere with normal playback?

If yes, then does the file need to have a certain name or would any chosen name need a certain syntax?

If no, is there a special text editor / method that could be used?

In either case, assuming a file with notes can be included within the structure, would any copying of the Disc also copy that file (Shrink, Rebuilder, etc)?

Thanks.