Cowboys S Patrick Watkins did all he could to make the team with a blocked field goal, interception return for a touchdown and a fourth-down stop on the goal line.
WR Kevin Ogletree, who stands a good chance of making the final Cowboys roster, left the game with a left eye contusion but said he could have returned.
Cowboys QB Jon Kitna fumbled a snap and threw an interception during his quarter-plus leading the offense.
Both Sage Rosenfels and John David Booty failed to impress on Friday night, leaving the Vikings with an unclear backup quarterback picture.
The Vikings saw both LB Erin Henderson and DE Brian Robison carted off the field with injuries.
Vikings WR Darius Reynaud returned a punt 81 yards for a touchdown and added two catches on offense.