Follow along with the video below to see how to install our site as a web app on your home screen.
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try installing rockplayer or Vplayer or other similar apps from the play store,
Vplayer is my favourite, it seems to play anything!
Windows can recognise the hardware decoding capabilities of the N7 and as a result will warn you if you try to copy files that aren't (fully) supported. Apps however, can decode via software so there is virtually no limit to the different kinds of video they can play (depends on the developer).
There are dozens of video players out there, my pick goes to MX Player. By far.
So don't worry about the windows message, read it and select 'copy anyway' or the likes. Then download a video player app.