Attachment File Types Restricted by Outlook 2003


By default, access is restricted to certain e-mail message attachments in Microsoft Outlook. In determining which attachments are blocked, Outlook checks the file type of the attachment. Files with certain file types can be completely blocked (Level 1) or the user may be required to save a file to disk before opening the file (Level 2).

By default, Outlook classifies a number of file type extensions as Level 1 and blocks files with those extensions from being received the users. There are no Level 2 file types by default, but you can create a list of Level 2 file types by using the Outlook Security template. You can demote file types from being categorized as Level 1 to being Level 2, or you can add other file types to create a Level 2 list.

Level 1 file types blocked by Outlook

The following table lists the Level 1 file types that are blocked under a default installation of Microsoft Office Outlook 2003. You can add or remove items from the default list through the Outlook Security Settings tab of the Outlook Security template.

File extension

File type

.ade

Microsoft Access project extension

.adp

Microsoft Access project

.app

FoxPro generated application

.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

.csh

Unix shell script

.exe

Executable file or program

.fxp

Microsoft FoxPro file

.hlp

Help file

.hta

HTML program

.inf

Setup information

.ins

Internet naming service

.isp

Internet communication settings

.js

Jscript file

.jse

Jscript-encoded script file

.ksh

Unix shell script

.lnk

Shortcut

.mda

Microsoft Access add-in program

.mdb

Microsoft Access program

.mde

Microsoft Access MDE database

.mdt

Microsoft Access file

.mdw

Microsoft Access file

.mdz

Microsoft Access wizard program

.msc

Microsoft Common Console document

.msi

Windows Installer package

.msp

Windows Installer patch

.mst

Visual Test source files

.ops

FoxPro file

.pcd

Photo CD image or Microsoft Visual Test compiled script

.pif

Shortcut to MS-DOS program

.prf

Microsoft Outlook Profile Settings

.prg

FoxPro program source file

.reg

Registration entries

.scf

Windows Explorer Command file

.scr

Screen saver

.sct

Windows script component

.shb

Shortcut into a document

.shs

Shell scrap object

.url

Internet shortcut

.vb

VBScript file

.vbe

VBScript-encoded script file

.vbs

VBScript file

.wsc

Windows script component

.wsf

Windows script file

.wsh

Windows script host settings file

.xsl

XML file that can contain script

Level 2 file types restricted by Outlook

There are no Level 2 file types by default, but you can create a list of Level 2 file types for your deployment. Level 2 file types are restricted (under a default installation of Outlook 2003) and you must first save a Level 2 file to disk before you can open it—Level 2 file types cannot be opened directly from an item in an e-mail message.

As an administrator, you can add or remove attachment types from the list of Level 2 file types through the Outlook Security Settings tab of the Outlook Security form. Also, you can demote attachment file types from Level 1 to Level 2 by using the Level1Remove registry key. For more information about setting the Level1Remove registry key, see “Administrator-Controlled Settings vs. User-Controlled Settings” earlier in this chapter.




Microsoft Office 2003 Resource Kit 2003
Microsoft Office 2003 Editions Resource Kit (Pro-Resource Kit)
ISBN: 0735618801
EAN: 2147483647
Year: 2004
Pages: 196

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