Can't play videos I downloaded onto sdcard from Galaxy SIII on HTC Evo

[sparklegirl24_7]

I recently downloaded some videos off of my galaxy s3 onto my sdcard. I wanted to make sure there were there before I deleted them from my phone so I swiped out the sdcard and put it into my husbands HTC evo. It shows that the video files are there but I can't play them. I can't click on them because the file is white with an exclamation point. What am I doing wrong?