Unblocking attachments in Microsoft Outlook

To provide enhanced security, Microsoft Office Outlook is designed to prevent you from unblocking attachments. But some time it becomes headache for you. Some times you don't require this feature. There are two levels of securities in Microsoft Office Outlook Level1 and Level2. Access to Level 1 files is blocked and can't be changed. When you receive an attachment with a Level 2 file type, you will be prompted to save the file to your hard disk. If you use Microsoft Exchange Server, your system administrator can add and remove file types for both levels of e-mail security.

Level 1

File 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
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)
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)
msi	Windows Installer File (Microsoft)
msp	Windows Installer Patch
mst	Windows SDK Setup Transform Script
ops	Office Profile Settings File
pcd	Visual Test (Microsoft)
pif	Windows Program Information File (Microsoft)
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
tmp	Temporary File/Folder
url	Internet Location
vb	VBScript File or Any VisualBasic Source
vbe	VBScript Encoded Script File
vbs	VBScript Script File Visual Basic for Applications Script
vsmacros	Visual Studio .NET Binary-based Macro Project (Microsoft)
vss	Visio Stencil (Microsoft)
vst	Visio Template (Microsoft)
vsw	Visio Workspace File (Microsoft)
ws	Windows Script File
wsc	Windows Script Component
wsf	Windows Script File
wsh	Windows Script Host Settings File

Level 2

There are no Level 2 files by default. If you use Microsoft Exchange Server, your system administrator may add and remove Level 2 file types, or allow you to reduce a Level 1 file to Level 2.

But what if you are not having Microsoft Exchange Server. Following is the resgistry trick which disable the Level1 security feature.

Start>run>regedit

HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
(Go to HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security for Outlook 2003 and HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security for Outlook 2002. )
 

Add a new string value called "Level1Remove".
 

Make its value a list of allowed file extensions separated by semicolons.
 

For example, ".shs;.exe" allows access to Shell Scrap Object File and executables.