IIRF + IIS 6 + Wordpress does not return 404 error

Question

I use IIRF for Wordpress redirects in IIS6, but does not return "Page not found" (404), always redirect to home directory for all missing files.

Permalink Structure:

/%postname%.html

IIRF rewrite:

RewriteRule /(.*)$ /index.php/$1 [I,L]