php - convert .htaccess to web.config iis 10

one text

Good evening, I should convert this .htaccess file to web.config, I tried to import it into UrlRewrite but when I open the pages it gives me 404, and I need .php at the end, I would like to remove it for all the pages present

RewriteEngine On
RewriteRule  ^p/(.*)$/?$ post.php?user=$1 [NC,L]
RewriteRule  ^register register.php [NC,L]
RewriteRule  ^login login.php [NC,L]
RewriteRule  ^u messages.php [NC,L]

I rewrote all the urls, the only one I can't rewrite is the url that generates post registration, which would be this https://example.com/u/username/view (view refers to a page called messages.php) and the starting code is this:

    //save user data to DB
    $statement = $pdo->prepare("INSERT INTO tbl_users (username,password,email) VALUES (?,?,?)");
    $statement->execute(array($username,md5($password),$email));
    $_SESSION['user'] = $username;
    header("location: ".BASE_URL.'u/'.$username.'/view');
}else{
    header("location: ".BASE_URL);
}

and the code in .htaccess is this:

RewriteRule ^ u messages.php [NC, L]