OK,
Download WordPress 2.7.
In file rewrite.php, which is in folder wp-includes, find the following script and change it
From:
$default_feeds = array(
'.*wp-atom.php$'=>$this->index .'?feed=atom',
'.*wp-rdf.php$' => $this->index .'?feed=rdf',
'.*wp-rss.php$' => $this->index .'?feed=rss',
'.*wp-rss2.php$' => $this->index .'?feed=rss2',
'.*wp-feed.php$' => $this->index .'?feed=feed',
'.*wp-commentsrss2.php$' => $this->index . '?feed=rss2&withcomments=1');
[/pre]
To:
$default_feeds = array(
'.*/wp-atom.php$'=>$this->index .'?feed=atom',
'.*/wp-rdf.php$' => $this->index .'?feed=rdf',
'.*/wp-rss.php$' => $this->index .'?feed=rss',
'.*/wp-rss2.php$' => $this->index .'?feed=rss2',
'.*/wp-feed.php$' => $this->index .'?feed=feed',
'.*/wp-commentsrss2.php$' => $this->index . '?feed=rss2&withcomments=1');
[/pre]
The only change was the forward slash (/) after the * on each line. See it? Not sure how to check what line it's on, but it's quie a long way into the file (Bright Cherry says it's 809-814).
After saving that, I uploaded all the WordPress 2.7 files again (including the newly modified rewrite.php file). I didn't re-upload wp-content folder though, as it would have affected my plugins I think.
Then run /wp-admin/upgrade.php
It might not seem to have worked straight away, so keep checking for a little while before you look for a different solution.
Hope that helps,
Michelle