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Override Outlook blocked access to the following potentially unsafe attachements
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This tech tip from the Group29 Tech forums has a large number of hits so it has been bumped to its own article.
Help, I just received an e-mail from an associate with a file I need, but I get the message: "Outlook blocked access to the following potentially unsafe attachments"!
This happens when you are using Outlook XP (2002) or Outlook 2003 and someone sends you a VBS, EXE, CHM, MDB, BAT, or other Level 1 security risk file. (See below for more). Now while a real hassle, there really is no reason someone should send you an exe in an email. So remember that this is a precautionary measure.
Here is how you get your file.
1. Close Outlook.
2. Open the Registry Editor.
3. If you using Office XP/2002, expand the branches to HKEY_CURRENT_USER Software Microsoft Office 10.0 Outlook Security
4. If you using Office 2003, expand the branches to HKEY_CURRENT_USER Software Microsoft Office 11.0 Outlook Security
5. Create a new string value by selecting New and then String Value from the Edit menu.
6. Name the new value Level1Remove.
7. Double-click the new Level1Remove to edit it, and enter the filename extensions you'd like to stop Outlook from blocking. Extensions should be typed in lower case, without the dots (.), and separated by semicolons . For example, type
exe;mdb;vbs
to allow .exe, .mdb, and .vbs attachments, respectfully.
9. Click Ok and then close the Registry Editor when you're done.
The next time you restart Outlook, you'll now be able to open previously-blocked attachments. (If an attachment is still blocked, you likely got the filename extension wrong.)
Make sure that you do this TEMPORARILY! This is actually a very useful feature.
Level 1 Security Risk Files blocked by Outlook XP and 2003
If you need to send a file from the list below and want to avoid problems with recipients who may have installed the patch, you can simply change the file name before attaching the file -- for example, rename an .exe file to a .ex_ file -- and include instructions on how to save it and rename it in the body of your message. Or use a zip utility like Winzip or 7-Zip to compress the file. Many Compression Tools are available to work automatically from within Outlook, though probably not all will be able to grab the .exe file, given the security surrounding attachments.
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
Original Group29 Tech Forum Entry
Override Outlook blocked access to the following potentially attachments
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Posted on Tuesday, December 11, 2007 @ 05:52:19 UTC by BB
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