On Windows 2003 server, ASP.NET run files with permission of Network Service user.

If you use ASP.NET and need to write/modify files on the server such as MS Access database, text file .., please open a ticket with technical support with detail which folder you need to enable write permission.

This is to ensure security for your website as well as the server hosted your sites.

Note: By default, php and asp scripts can read and write to all files/folders on your hosting account.

PremiumReseller provides Windows Reseller plans with DotNetPanel which allows you to configure ASP.NET write permission in File Manager.

http://www.premiumreseller.com/windows-hosting.htm