Sophos Anti-Virus for Windows: How to configure MIME types for a Web CID in IIS 7.0

This article describes how to configure MIME Types for a WebCID (central installation directory) using Windows Server 2008 and IIS (Internet Information Services) 7.0.

NOTE: If you need to configure MIME types on Windows 2000 or Windows 2003, and IIS version 6, refer to the relevant section in the knowledgebase article Sophos Anti-Virus for Windows: How to create a web CID

Only files with extensions registered in the IIS 7.0 MIME type list will be served. All extensions must be listed, along with an accepted Content-type. (".txt" and "text/plain" for example). You will receive an HTTP Error 403.3 - Not Found error if the file extension is not allowed.

This is best practice, as all unknown extensions will be blocked by default, and you must explicitly whitelist an extension in order to allow access. (Please see http://learn.iis.net/ for more information).

1. Open Internet Information Services (IIS) Manager. (To do this click Start|Administrative Tools|Internet Information Services (IIS) Manager.)
2. Select the Sophos WebCID website you have created. Under the 'Features View' area in the IIS section, double-click on 'MIME Types'. A list of the default accepted MIME Types will appear.
3. On the Actions pane, click 'Add... '
4. For the File name extension: field, enter the file extension needed. For example .ide
5. In the 'MIME type' field, type the Content-type. For example text/plain
6. Click OK. Your registered MIME type will be displayed.
7. Repeat this process for all of the file extensions required. (Any file extensions present in your WebCID but not showing in the 'MIME Types' list must be added.)
8. Close Internet Information Services when finished.

ESXP and SAVSCFXP Web CIDs require the following extensions to be added to the list of default extensions provided in IIS:

.
.upd
.conf
.spi
.pem
.dat
.mst
.cfg
.ppi
.ide
.vdb
.bdl
.sys
.url
.policy
.ini
.bd2
.base

All extensions may be entered as "application/sophos-x"

Other extensions will be required for non-Windows operating systems.