Are you able to send the doc via Internet Explorer using Yahoo?

Did you check your Mozilla settings?

I have a Dell running XP, using Mozilla Firefox and Yahoo email and I encountered the same problem. It looks like the .doc attaches for all practical purposes, paper clip and all but no file.

See previous post a couple of hours ago for my fix.

I had the same problem using Yahoo mail and Firefox. I believe it was after a recent Mozilla Firefox update that it changed. Here's what I found:

On the Mozilla Firefox menu bar - under Tools>Options>Content> at the bottom is File Types with a Manage Button.

I noticed for the file extension ".doc" there were two entries. One of them did not have an associated "action" so I removed it.

All works fine now.