What is the difference between playing a Blue Ray Disk and playing a Blue Ray format file on computer?

I am curious about this. Someone gave me a flash drive with a blue ray format movie on it. Can I just play this on my PC? What is the difference of playing blue ray off a disk in a drive (blue ray player) and just playing the file on my computer? I have my computer hooked up to a 1080P hd tv via HDMI if that... show more I am curious about this. Someone gave me a flash drive with a blue ray format movie on it. Can I just play this on my PC? What is the difference of playing blue ray off a disk in a drive (blue ray player) and just playing the file on my computer? I have my computer hooked up to a 1080P hd tv via HDMI if that helps. Thanks.
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