Blocked attachments in Outlook

Modified on: 2017-07-20 15:49:13 -0400


Blocked attachments in Outlook

To help protect your computer, Microsoft Outlook 2010 does not allow you to receive files of certain types (such as .exe files) as attachments, because of their potential for introducing a virus into your computer. Outlook blocks these files by default.

Share your files safely

If you want to receive a file of a type that is blocked by Outlook, you can ask the sender to either make the file accessible without using Outlook, or make it less likely to be blocked by Outlook. Following are a few safe ways to share files with people you trust.

Use a file compression utility. Using a compression utility, such as WinZip or the utility built into Windows (right-click on a file and choose send to compressed folder), creates a compressed archive file that has a different file name extension. Outlook does not recognize these file name extensions as potential threats. Therefore, it does not block the new attachment.

Rename the file. You can request that the sender rename the attachment to use a file name extension that Outlook does not recognize as a threat. For example, an executable file that has the file name extension .exe could be renamed as a Word 2010 file that has a .docx file name extension.

Use a shared server. You might want to ask the sender to save the attachment to a server or an FTP site that you can access. This can include a secure network share server such as SharePoint. The sender can send you a link to the attachment on the server or FTP site. You can click the link to access the file and save it on your computer.

Ask the sender to resend the renamed attachment to you. To save the attachment and rename it to use the original file name extension, do the following:

Locate the attachment in the email message.

Right-click the attachment, and then click Copy.

Right-click the desktop, and then click Paste.

Right-click the pasted file, and then click Rename.

Rename the file to use the original file name extension, such as .exe.

Attachment file types blocked in Outlook

File name extension

                File type
.ade
Access Project Extension (Microsoft)
.adp
Access Project (Microsoft)
.app
Executable Application
.asp
Active Server Page
.bas
BASIC Source Code
.bat
Batch Processing
.cer
Internet Security Certificate File
.chm
Compiled HTML Help
.cmd
DOS CP/M Command File, Command File for Windows NT
.com
Command
.cpl
Windows Control Panel Extension (Microsoft)
.crt
Certificate File
.csh
csh Script
.der
DER Encoded X509 Certificate File
.exe
Executable File
.fxp
FoxPro Compiled Source (Microsoft)
.gadget
Windows Vista gadget
.hlp
Windows Help File
.hta
Hypertext Application
.inf
Information or Setup File
.ins
IIS Internet Communications Settings (Microsoft)
.isp
IIS Internet Service Provider Settings (Microsoft)
.its
Internet Document Set, Internet Translation
.js
JavaScript Source Code
.jse
JScript Encoded Script File
.ksh
UNIX Shell Script
.lnk
Windows Shortcut File
.mad
Access Module Shortcut (Microsoft)
.maf
Access (Microsoft)
.mag
Access Diagram Shortcut (Microsoft)
.mam
Access Macro Shortcut (Microsoft)
.maq
Access Query Shortcut (Microsoft)
.mar
Access Report Shortcut (Microsoft)
.mas
Access Stored Procedures (Microsoft)
.mat
Access Table Shortcut (Microsoft)
.mau
Media Attachment Unit
.mav
Access View Shortcut (Microsoft)
.maw
Access Data Access Page (Microsoft)
.mda
Access Add-in (Microsoft), MDA Access 2 Workgroup (Microsoft)
.mdb
Access Application (Microsoft), MDB Access Database (Microsoft)
.mde
Access MDE Database File (Microsoft)
.mdt
Access Add-in Data (Microsoft)
.mdw
Access Workgroup Information (Microsoft)
.mdz
Access Wizard Template (Microsoft)
.msc
Microsoft Management Console Snap-in Control File (Microsoft)
.msh
Microsoft Shell
.msh1
Microsoft Shell
.msh2
Microsoft Shell
.mshxml
Microsoft Shell
.msh1xml
Microsoft Shell
.msh2xml
Microsoft Shell
.msi
Windows Installer File (Microsoft)
.msp
Windows Installer Update
.mst
Windows SDK Setup Transform Script
.ops
Office Profile Settings File
.pcd
Visual Test (Microsoft)
.pif
Windows Program Information File (Microsoft)
.plg
Developer Studio Build Log
.prf
Windows System File
.prg
Program File
.pst
MS Exchange Address Book File, Outlook Personal Folder File (Microsoft)
.reg
Registration Information/Key for W95/98, Registry Data File
.scf
Windows Explorer Command
.scr
Windows Screen Saver
.sct
Windows Script Component, Foxpro Screen (Microsoft)
.shb
Windows Shortcut into a Document
.shs
Shell Scrap Object File
.ps1
Windows PowerShell
.ps1xml
Windows PowerShell
.ps2
Windows PowerShell
.ps2xml
Windows PowerShell
.psc1
Windows PowerShell
.psc2
Windows PowerShell
.tmp
Temporary File/Folder
.url
Internet Location
.vb
VBScript File or Any Visual Basic Source
.vbe
VBScript Encoded Script File
.vbs
VBScript Script File, Visual Basic for Applications Script
.vsmacros
Visual Studio .NET Binary-based Macro Project (Microsoft)
.vsw
Visio Workspace File (Microsoft)
.ws
Windows Script File
.wsc
Windows Script Component
.wsf
Windows Script File
.wsh
Windows Script Host Settings File
.xnk
Exchange Public Folder Shortcut




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