What are these divx movies?

I keep downloading these divx movies off morpheus that are like a few mb in size but they say that they're like 100 min long but then every time I try to play it it says player error, how do I fix this?
 
You need to install the DivX Codec to be able to view them on the PC. Get the latest version 4.12 from h**p://www.divx.com
 
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