This has been verified on WP 3.4.2 and 3.6
Windows 2008 IIS7 server
Replicated on another server, with another new test/dev site, Windows 2008 R2 IIS7.5
Pages appear to be fine. If the wrong URL is used, it's 404.
Posts are not.
However, it also shows up here:
Something is wrong. As long as "post.html" is the ending of the URL, anything goes.
No plugins were used.
The default 2011 theme was used.
htaccess (Windows) and web.config were both disabled on a index.php test version.
This issue did not exist on WordPress 2.9.2
This issue is with WordPress 3.4+ (maybe 3.0 - 3.3).
Why is this happening?