I noticed that in the INSTALL.txt this is mentioned:
4)In includes/filenames.php
Add just before the ?>
// Google Sitmap BOF
define('FILENAME_GOOGLE_SITEMAPS', 'sitemaps.index.php');
// Google Sitmap END
However, in the Install.old.html the following is mentioned:
4. Open /includes/filenames.php
And add the following:
// Google XML Sitemap
define('FILENAME_GOOGLE_SITEMAP', 'googlesitemap.php');
// Fine
Both don't work in my case, but which one is correct ?