Creative Sound Blaster X-Fi User Manual page 39

Decoding from a software DVD player
To play Dolby Digital or DTS encoded DVDs on your computer, you need to
install the latest version of a software DVD player such as WinDVD or
PowerDVD.
You can download the following software* and codecs*:
CyberLink PowerDVD player
MPEG-2 decoder
DTS decoding codec
Dolby Digital decoding codec
Some product models enable you to upgrade PowerDVD, and download its
codec, in the following ways:
Click Start Programs or All Programs Creative Get PowerDVD.
Notes
*Available without additional charge for some models of your audio card.