Blocked Email Attachment Types

We are silently blocking nearly all attachment types classified as unsafe in Microsoft Knowledge Base Article - 262631 with the exception of Access database files (extension of mdb). This list to be blocked includes:

Extension       File type
.app Visual FoxPro Application
.ade Microsoft Access project extension
.adp Microsoft Access project
.ani Animated Icon
.asx Windows Media Audio / Video
.bas Microsoft Visual Basic class module
.bat Batch file
.chm Compiled HTML Help file
.cmd Microsoft Windows NT Command script
.com Microsoft MS-DOS program
.cpl Control Panel extension
.crt Security certificate
.cur Animated Icon
.csh Unix shell extension
.exe Program
.fxp Visual FoxPro Compiled Program
.hlp Help file
.hta HTML program
.ico Animated Icon
.inf Setup Information
.ins Internet Naming Service
.isp Internet Communication settings
.js JScript file
.jse Jscript Encoded Script file
.ksh Unix shell extension
.lnk Shortcut
.mda Microsoft Access add-in program
.mde Microsoft Access MDE database
.mdt Microsoft Access workgroup information
.mdw Microsoft Access workgroup information
.mdz Microsoft Access wizard program
.msc Microsoft Common Console document
.msi Microsoft Windows Installer package
.msp Microsoft Windows Installer patch
.mst Microsoft Windows Installer transform;
Microsoft Visual Test source file
.ops Office XP settings
.pcd Photo CD image; Microsoft Visual compiled script
.pif Shortcut to MS-DOS program
.prf Microsoft Outlook profile settings
.prg Visual FoxPro Program
.reg Registration entries
.scf Windows Explorer command
.scr Screen saver
.sct Windows Script Component
.sh Shell Script
.shb Shell Scrap object
.shs Shell Scrap object
.url Internet shortcut
.vb VBScript file
.vbe VBScript Encoded script file
.vbs VBScript file
.wmf Windows Metafile
.wmz Windows Media File
.wsc Windows Script Component
.wsf Windows Script file
.wsh Windows Script Host Settings file

It is possible that other extensions will have to be blocked in the future, given that virus authors frequently use new approaches.