From the Server Manager, choose the Server Preferences tab.
Click the MIME Types link.
The Global MIME Types window appears. For more information on the Global MIME Types, see Choosing MIME Types.
Add a new MIME type with the following settings:
Content type: magnus-internal/wincgi.
File Suffix: Enter the file suffixes that you want the server to associate with Windows CGI. If you activated CGI, WinCGI, and shell CGI file types, you must specify a different suffix for each type of CGI. For example, you can’t use the suffix .exe for both a CGI program and a shell CGI program. If you need to, you can edit the other MIME type fields on the page so that the suffixes are unique.
Click the New Type button.
Save and apply your changes.