The File Access Component exposes methods and properties you can use to access a computer's file system. To use the File Access Component, create a FileSystemObject object like so:
<% Set fso = Server.CreateObject("Scripting.FileSystemObject") %>
For further information on the FileSystemObject, see the reference at Windows Script Technologies. Click on VBScript or JScript, Documentation, Language Reference, then in the right frame, click on Objects, and FileSystemObject Object.