hmmm, depends where you are submitting too. most place take rss2 – but some still parse the original rss feed… are you sure you made the correct alterations in the file? / did you refresh / clear your cache when validating it?
QUICK SIMPLE FIX :
for rss1 – open the file wp-rss.php from the wp root
for rss2 – open the file wp-rss2.php from the wp root
etc.
find (around line 9)
header(‘Content-type: text/xml’, true);
and replace with
header(‘Content-type: application/xml’, true);
this works, try validating:
http://www.funkdub.info/wp/wp-rss.php
with:
http://feedvalidator.org/