wsw70,

The format you'll want to use is listed in the manual. There are specific resolutions, codecs, and audio codecs that will work with certain files.

This would be listed in your manual, and would look something like this: (this is the U.S. version)

http://i397.photobucket.com/albums/pp60/samsung_hd_tech/LN52B750Formats.jpg

DTS would not be supported through the Samsung, as it will only output 2.0 audio, not 5.1 audio.

Does that help?

--HDTech