Setting a default page in ISS for a site inside a folder of main site

I have site hosted on IIS (windows server 2012).
In this I have a subfolder called "Admin", this folder contains a pages which are for Admin users only.
I need to set a default page for this "Admin" folder so that when Admin users types in browser "www.mysite/admin" than the SignIn.aspx should be picked up as first page.

Is it possible to do in IIS?
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Big MontyWeb Ninja at largeCommented:
you would have to do this with code. put a default.aspx file, and it's code behind, do:

public override void ProcessRequest(HttpContext context) {
    context.Response.Redirect("Signin.aspx", true);

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assuming this is for .NET, and not classic asp, as you have defined in your zones
Why not rename
add default document as SignIn.aspx in IIS and if you have any other pages like default.aspx in the folder, move the SignIn.aspx to top postion

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Microsoft IIS Web Server

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