I need to make a quick sitecore admin script to inspect a series of items. I need to do this without compiling my solution. I made a sample ASPX page under /sitecore/admin/ using:

<script runat="server" language="text/c#">

but when I try to view it I get Sitecore telling me ItemNotFound.

Is this type of 'pure script' page supported under Sitecore? Is there a piece of functionality I am missing?