It turns to be a problem with IIS running in fast CGI.
alk.
I’ve already done all the suggestion of that links, the strange problem is that permalinks works only for url that have a lenght greater than a certaion number.
I find also that the minimum lenght of the url that works, has the same lenght of the first part of the link
http://www.codewrecks.com/blog/index.php
it must not be casual
alk.