There is only one file type that uses the .TIX extension:
DivX Video Download Activation File
File used by DivX player, a video player program; does not contain data, but exists as an empty file that triggers video download from a DivX partner site; served to users upon payment for a video and deleted immediately after the video starts to download.
NOTE: If you manually download video from a confirmation web page link or an email, a TIX file will initially be downloaded. Open this file in DivX player to begin the video download.
Updated: October 9, 2009