major2000

THX for the info. I just upgraded to Wp 1.52, which was easily done. I just had to do minor manual work changing some lines.
The guide from codex.wordpressorg about upgrading from 1.2 to 1.5 was very helpful.

I use WP1.2 and my .htaccess is

RewriteEngine On
RewriteBase /blog/
RewriteRule ^category/(.*)/(feed|rdf|rss|rss2|atom)/?$ /blog/wp-feed.php?category_name=$1&feed=$2 [QSA]
RewriteRule ^category/?(.*) /blog/index.php?category_name=$1 [QSA]
RewriteRule ^author/(.*)/(feed|rdf|rss|rss2|atom)/?$ /blog/wp-feed.php?author_name=$1&feed=$2 [QSA]
RewriteRule ^author/?(.*) /blog/index.php?author_name=$1 [QSA]
RewriteRule ^([_0-9a-z-]+)/?([0-9]+)?/?$ /blog/index.php?name=$1&page=$2 [QSA]
RewriteRule ^([_0-9a-z-]+)/?/(feed|rdf|rss|rss2|atom)/?$ /blog/wp-feed.php?name=$1&feed=$2 [QSA]
RewriteRule ^([_0-9a-z-]+)/?/trackback/?$ /blog/wp-trackback.php?name=$1 [QSA]
RewriteRule ^feed/?([_0-9a-z-]+)?/?$ /blog/wp-feed.php?feed=$1 [QSA]
RewriteRule ^comments/feed/?([_0-9a-z-]+)?/?$ /blog/wp-feed.php?feed=$1&withcomments=1 [QSA]