I don't know what email software you are using, but most email software applications don't play videos.
That's why I 'save' my video attachments from any emails to my hard disk, then let Windows play them from there.
Does that work with you?
Mark
I have Windows XP I get a error saying there's no program associated to perform this action & create association in folder options. I have Realplayer. Also she put them on youtube & all I can get there is the sound, no picture. I tried regsvr32/i shimgvm.dull got nothing. can you help? dw

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic