Thread:Project:Support desk/DeleteBatch doesn't find pages with quote or with accents

Mediawiki 1.15.2 PHP 5.3.2 Mysql 5.0.7

I'm using the DeleteBatch script maintenance to delete a lot of pages. I created some text files with some titles to delete. for example :

Today's_featured_article/fr/March_26,_2010

Today's_featured_article/fr/March_29,_2010

Bac_à_sable

When I run the maintenance script, I have a 'skipping nonexistent page' error message. I tried to change character encoding and put everything in UTF-8 but it doesn't change anything. Any reason or it is a bug ?