I've done a fresh multisite WP 3.0 install, updated all the .htaccess etc. Then I did an export from a WPMU 2.9.2 site into 3.0. During import I told it to go off and also download/upload all the images and attachments too, which it duly did.
However, all the actual img src links in the imported posts are all obviously referring to the old WPMU 2.9.2 URL structure of
http://domainname.com/wp-content/uploads/2010/06/nameofimage.jpg rather than the new WP 3.0 URL's
And I can't think of a way of amending the .htaccess file (for instance) to rewrite these legacy links to the new URL structure - coz I've already got
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L] in the new .htaccess file.
Any ideas or am I missing something very obvious?