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Attachment file types restricted by Outlook 2010

Published: May 16, 2012

Some attachments in items (such as e-mail messages or appointments) in Microsoft Outlook 2010 have restricted access. Files that have specific extensions can be categorized as Level 1 (the user cannot view the file) or Level 2 (the user can open the file after saving it to disk).

Not an IT Professional?
This article is for IT Professionals. If you’re not an IT Professional, but want to learn more about how to share files that have restricted file types, see Blocked attachments in Outlook (http://go.microsoft.com/fwlink/p/?LinkId=188575).

By default, Outlook 2010 classifies several file types as Level 1 and blocks files that have those extensions from being received by users. As an administrator, you can use Group Policy to manage how a file type is categorized for e-mail attachment blocking. For example, you can change a file type categorization from Level 1 to Level 2 or create a list of Level 2 file types. There are no Level 2 file types by default. For more information, see Plan attachment settings in Outlook 2010.

The following table lists Level 1 file types that are blocked under a default installation of Outlook 2010.

File extension File type

.ade

Microsoft Access project extension

.adp

Microsoft Access project

.app

Application file

.asp

Active server page

.bas

Microsoft Visual Basic class module

.bat

Batch file

.cer

Internet Security Certificate file

.chm

Compiled HTML Help file

.cmd

DOS CP/M command file, Microsoft Windows NT command script

.cnt

Windows Help contents file

.com

Microsoft MS_DOS program

.cpl

Control Panel extension

.crt

Security certificate

.csh

Script file

.der

DER Encoded X509 certificate file

.exe

Executable file

.fxp

Microsoft Visual FoxPro compiled program

.gadget

Windows Gadget

.grp

Windows program group file

.hlp

Help file

.hpj

Help project file

.hta

HTML program

.inf

Information or setup file

.ins

Internet Naming Service

.isp

Internet Communication settings

.its

Internet Document Set file

.jar

JAVA archive file

.js

JavaScript source code

.jse

JScript Encoded script file

.ksh

UNIX Shell script file

.lnk

Windows shortcut

.mad

Microsoft Access module shortcut

.maf

Microsoft Access shortcut

.mag

Microsoft Access diagram shortcut

.mam

Microsoft Access macro shortcut

.maq

Microsoft Access query shortcut

.mar

Microsoft Access report shortcut

.mas

Microsoft Access stored procedures

.mat

Microsoft Access table shortcut

.mau

Media attachment unit

.mav

Microsoft Access view shortcut

.maw

Microsoft Access data access page

.mcf

Manifest configuration file

.mda

Microsoft Access add-in program

.mdb

Microsoft Access program

.mde

Microsoft Access MDE database file

.mdt

Microsoft Access data file

.mdw

Microsoft Access workgroup

.mdz

Microsoft Access wizard program

.msc

Microsoft Common Console document

.msh

Windows PowerShell script helper

.msh1

Windows PowerShell script helper

.msh2

Windows PowerShell script helper

.mshxml

Windows PowerShell script helper

.msh1xml

Windows PowerShell script helper

.msh2xml

Windows PowerShell script helper

.msi

Windows Installer package

.msp

Windows Installer update package file

.mst

Visual Test source file

.ops

Microsoft Office profile settings file

.osd

Open software description file

.pcd

Microsoft Visual Test compiled script

.pif

Windows program information file

.pl

Perl script file

.plg

Developer Studio build log

.prf

Outlook profile file

.prg

Program source file

.ps1

Windows PowerShell

.ps1xml

Windows PowerShell

.ps2

Windows PowerShell

.ps2xml

Windows PowerShell

.psc1

Windows PowerShell

.psc2

Windows PowerShell

.pst

Microsoft Outlook personal folder file

.reg

Registration entries, Registry data file

.scf

Windows Explorer command file

.scr

Windows screen saver

.sct

Windows script component

.shb

Windows shortcut to a document

.shs

Shell Scrap object file

.tmp

Temporary file or folder

.url

Uniform Resource Locator (Internet shortcut)

.vb

Microsoft Visual Basic Scripting Edition (VBScript) file

.vbe

VBScript Encoded script file

.vbp

Visual Basic project file

.vbs

VBScript script file, Visual Basic for Applications script file

.vsmacros

Microsoft Visual Studio .NET binary-based macro project file

.vsw

Microsoft Visio workspace file

.ws

Windows script file

.wsc

Windows script component

.wsf

Windows script file

.wsh

Windows Script Host settings file

.xbap

XAML browser application

.xnk

Microsoft Exchange public folder shortcut

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