How do I find the missing codec of an .mov?

[Sabrinabbb3]

Upon opening up an .MOV file. I get the message: Missing codec. This item was encoded in a format that's not supported. 0xc00d5212. I have opened up many other like files without a problem. The video function is not working. The audio function works.

I can open up the same .MOV file in Drop-Box without a problem but not after I have downloaded it to my desktop.

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