Is it possible to have a simple user-password authentication without having a login form?

I'm searching for this, but I can't find it, yet I know that this can be done with an htaccess file, since this is what the screenshot below does.

I want to secure a folder behind a preset username and password. I can't create a Windows user since I do not own the server and we don't need an authentication form. We want to use the default authentication form of the browser.

How is this possible from the web.config?

This i what I have but it does not work

<system.web>    开发者_如何学运维
    <authentication mode="Forms">
      <credentials passwordFormat="Clear">
        <user name="test" password="test" />
      </credentials>
    </authentication>
    <authorization>
      <allow users="test" />
      <deny users="*" />
    </authorization>
</system.web>

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This is not possible with forms authentication.

There seems to be a third party library to use htaccess/htpasswd style directory access configuration on IIS:

http://www.helicontech.com/ape/

See also .htaccess or .htpasswd equivalent on IIS?