Why is my phone saying cannot display file

[rgoad]

I don't loaded a video off a email and it won't let me watch it.. it says file can't open

 

[zenic032797]

the type of file of the video isn't going to let you watch it on what ever you're using what phone is it?
if it's android use mxplayer and the extensions for it to watch it, if it's apple let me know so I can find a app that will let you watch that type of file.