hi ajime. welcome to the asylum.
looking at your error, (/header/header.php/test/sample.html) it looks like in your htaccess, the call to the header.php is not right. From the tutorial : Action headered /header/header.php This would be more of a *nix style directory structure.
If you try to open /test/sample.html and it is wanting to download the file and have a bunch of junk code in it, it sounds like your Appserv is not parsing the php right.
Also, make sure your http.conf file is set correctly to handle the htaccess files. Not sure how you are saving that file because Windows doesn't allow .htaccess to be saved like *nix does. Have a look here to get a good example of a way to save htaccess files for windows.
Hope that might help lead you in some sort of "right" direction.
Later,
C:\