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File Types Impacted by the Outlook E-mail Security Update


Since the following file types — listed by file extension — can execute malicious code, they are disabled in e-mail messages if the Outlook E-mail Security Update is installed. As a protection from potential viruses, users are restricted from accessing these attachments from within Outlook.

Read how to Add a File Type to the Outlook E-mail Security List below the table

File Extension Description
ADE Microsoft Access Project Extension
ADP Microsoft Access Project
BAS Visual Basic® Class Module
BAT Batch File
CHM Compiled HTML Help File
CMD Windows NT® Command Script
COM MS-DOS® Application
CPL Control Panel Extension
CRT Security Certificate
EXE Application
HLP Windows® Help File
HTA HTML Applications
INF Setup Information File
INS Internet Communication Settings
ISP Internet Communication Settings
JS JScript® File
JSE JScript Encoded Script File
LNK Shortcut
MDB Microsoft Access Application
MDE Microsoft Access MDE Database
MSC Microsoft Common Console Document
MSI Windows Installer Package
MSP Windows Installer Patch
MST Visual Test Source File
PCD Photo CD Image
PIF Shortcut to MS-DOS Program
REG Registration Entries
SCR Screen Saver
SCT Windows Script Component
SHS Shell Scrap Object
URL Internet Shortcut (Uniform Resource Locator)
VB VBScript File
VBE VBScript Encoded Script File
VBS VBScript Script File
WSC Windows Script Component
WSF Windows Script File
WSH Windows Scripting Host Settings File

When you install the Outlook 98/2000 E-mail Security Update, Outlook checks the file type of each attachment received in your Inbox. Outlook compares the file type against two different lists of file types — Level 1 security file types and Level 2 security file types. Access to Level 1 security file types is restricted since they can execute programs or code, or contain links to programs that could execute. Access to Level 2 security file types is not restricted, however you can only save them to your hard disk drive. Access to files that are not on these lists is not restricted.

Caution  The procedure below requires editing your registry. It should only be performed by advanced users and only after making copies of your registry files, System.dat and User.dat — both hidden files in the Windows® folder. Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

  1. On the Windows taskbar, click Start, and then click Run.
  2. In the Open box, type regedit, and then click OK.
  3. Do one of the following:
    Level 1
    1. Click the HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Security.
    2. On the Edit menu, point to New, and then click the Level1AttachmentAdd Type key.
    3. Click Type and then enter a text string for the file extension you want to add. You can separate multiple types with semi-colons ( ; ).

    Key: Level1AttachmentAdd
    Type: <string>

    Level 2
    1. In HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Security
    2. On the Edit menu, point to New, and then click the Level2AttachmentAdd Type key.
    3. Click Type and then enter a text string for  the file extension you want to add. You can separate multiple types with semi-colons ( ; ).

    Key: Level2AttachmentAdd
    Type: <string>




 
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