Purpose of .htaccess file content in admin

What is the purpose for the following code in the .htaccess files found in the admin folder?

<IfModule mod_setenvif.c>
  <IfDefine SSL>
    SetEnvIf User-Agent ".*MSIE.*" \
             nokeepalive ssl-unclean-shutdown \
             downgrade-1.0 force-response-1.0
  </IfDefine>
</IfModule>

And what happens if I don't upload these .htaccess files?

It adjustments to the SSL protocol for Internet Explorer browsers ... just as the comment immediately above it says.

If you don't upload it earlier versions of IE6 may be unable to connect to your SSL server because of an incompatibility with the SSL standard in the re-negociation mechanism.

Older versions risk losing form data if server response times are slow.

Why are you considering not uploading it?

Okay, in that case, I'll upload it. I was just hestitant in putting things in .htaccess that I didn't understand.