Sharing files over server and CSS & PHP

I'm developing a site that's XHTML, CSS and PHP-based (no MySQL or any database
- a lot of SSI) .

I upload these .html and .php files over the Unix-based server. My boss
downloads them. She opens them in Dreamweaver Version 4 (I use Dreamweaver MX),
and finds an unnecessary </div> at the end. She edits these files and saves
them and upload them back to the server. I get them and that unnecessary </div>
messes us the webpage layout.

However, when she opens these files in Notepad, she does not see the
unnecessary </div>. I don't want her to use Notepad to make minor edits (like
fix a spelling mistake), since she's used to Dreamweaver. Why does Dreamweaver
4 adds that unnecessary </div> (BTW, she edits in code view and not the image
view).

*bump*

Somebody knows?