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Q: What file attachment types are blocked by Microsoft Outlook by default?
 
A: It varies depending on the version of Microsoft Outlook and the applied service pack. The most common file attachment types that are blocked by Microsoft Outlook are:
File extension File Type
.ade Microsoft Access project extension
.adp Microsoft Access project
.app Microsoft Visual FoxPro application (blocked only in Outlook 2002 SP-2 and Outlook 2000 SP-3)
.asp Active server page. (Blocked in Outlook 2002 SP3 and higher)
.asx Windows Media Audio or Video shortcut (blocked only in Outlook 2002 builds earlier than 10.0.3005.x)
.bas Visual Basic class module
.bat Batch file
.cer (blocked only in Outlook 2003 and later)
.chm Compiled HTML Help file
.cmd Windows NT Command script
.com MS-DOS program
.cpl Control Panel extension
.crt Security certificate
.csh KornShell script file (blocked only in Outlook 2002 SP-2 and Outlook 2000 SP-3 and later)
.exe Program
.fxp Microsoft Visual FoxPro compiled program (blocked only in Outlook 2002 SP-2 and Outlook 2000 SP-3 and later)
.hlp Help file
.hta HTML program
.inf Setup Information
.ins Internet Naming Service
.isp Internet Communication settings
.js JScript Script file
.jse Jscript Encoded Script file
.ksh KornShell script file (blocked only in Outlook 2002 SP-2 and Outlook 2000 SP-3 and later)
.lnk Shortcut
.mda Microsoft Access add-in program (blocked only in Outlook 2002 and a patched version of Outlook 2000)
.mdb Microsoft Access program
.mdt Microsoft Access workgroup information (blocked only in Outlook 2002 SP-1 and Outlook 2000 SP-3 and later)
.mdw Microsoft Access workgroup information (blocked only in Outlook 2002 SP-1 and Outlook 2000 SP-3 and later)
.mde Microsoft Access MDE database
.mdz Microsoft Access wizard program (blocked only in Outlook 2002 and a patched version of Outlook 2000)
.msc Microsoft Common Console document
.msi Windows Installer package
.msp Windows Installer patch
.mst Visual Test source files
.ops Office XP settings (blocked only in Outlook 2002 SP-1 and and Outlook 2000 SP-3 later)
.pcd Photo CD image
.pif Shortcut to MS-DOS program
.prf Microsoft Outlook profile settings (blocked only in Outlook 2002)
.prg Microsoft Visual FoxPro program (blocked only in Outlook 2002 SP-2 and Outlook 2000 SP-3)
.pst Microsoft Outlook Personal Folders file (blocked only in Outlook 2000 SP-3)
.reg Registration entries
.scf Windows Explorer command (blocked only in Outlook 2002)
.scr Screen saver
.sct Windows Script Component
.shb Shell Scrap Object
.shs Shell Scrap Object
.tmp Temporary file. (Blocked in Outlook 2002 SP3 and higher)
.url Internet shortcut
.vb VBScript file
.vbe VBScript encoded script file
.vbs Visual Basic Script file
.vsmacros Visual Studio .NET macro project file. (Blocked in Outlook 2002 SP3 and higher)
.vss Visio shapes and Visio stencils (Blocked in Outlook 2002 SP3 and higher)
.vst Visio template (Blocked in Outlook 2002 SP3 and higher)
.vsw Visio workspace (Blocked in Outlook 2002 SP3 and higher)
.ws Windows script file (Blocked in Outlook 2002 SP3 and higher)
.wsc Windows Script Component
.wsf Windows Script file
.wsh Windows Script Host Settings file
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