variations in sending email & I.Messaging

Hi, forgive me if this is not the correct newsgroup, but I thought I'd start
here.
I always use yahoo for email and for Instant messaging. But if needed, I can
use my email that I got through my ISP (dial-up)-
Questions:
(1) Is it possible to send .wav &/or .avi files to an email address where
the recipient has also a yahoo address?
(2) Also, while Instant messaging, can I place a link to the person I am
chatting with so that she can click on it to open it and see (avi) or hear
(wav) a file.
Is there a program that I need. Is there a free one. I dont have any
experience on this but if someone knows, please help. thanks alot.
windows xp - sp1 - dial up- and have security for my pc.


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