When i try to upload a 1 mb wma music file to a yahoo group i get an "internet explorer can't display" message

I'm the owner-moderator of the group. The music file is 1 or 1.5 mb. I'm using a dial up connection. I was able to send the music file as an attachment to an email message in Yahoo Mail without problem. I don't have any problem uploading photos to the group site (but they aren't as large).