To enable divx playback on your computer you either need the correct codecs for your playback program or get a program that has built-in divx playback functionality. I like VLC Media Player a lot.
Did you write the file to a dvd+r or did you write a converted to dvd video format of that file to a dvd+r?
If the first: can your standalone dvd player handle the divx format?
if the second: did you close the disc and set the booktype?