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How to Unlock Attachment Restriction in Microsoft Outlook

The article intends to help users undo restrictions on their Outlook attachments and download them without difficulty. The methods described here are simple and reliable. It is, however, recommended that users follow the instructions accurately to avoid facing common Microsoft Outlook problems and eventually calling Microsoft technical help to resolve them.

Microsoft Outlook has been designed to allow users send or receive emails (one among the other things) and at the same time restrict them from accessing files attachments (.bat or.exe etc.) that potentially contain viruses or malware among other infections. Most of the users find it really annoying when they cannot download the attachments sent to them in Outlook. Every time you try to download an attachment, it shows an error message like ‘Outlook blocked access to the following potentially unsafe attachments: click file.exe’. Well, security is definitely a good practice, but it may irritate users like anything, especially when they know that the file is sent from a trusted source. Don’t worry! The below mentioned guide will help download and access the desired attachments in Outlook without problems.


Unblocking attachments requires a key to be added to the Windows Registry Editor. Follow the below mentioned procedure to do so.

Close the Outlook window if it is opened. Click on the Start menu and navigate to Run . When the Run window opens, type ‘regedit’ (without quotes and as is) in the respective box, and hit Enter on the keyboard.

This will open up the Registry Editor window. Click on the ‘ + ‘ sign next to HKEY_CURRENT_USER and then navigate to Software Microsoft Office12.0 Outlook Security. Click on the Edit tab at the top, click New from the dropdown menu, and then select String Value . Give a name to the value like Level 1 Remove. When done, right click on Level1Remove and then select Modify from the drop down menu. Now type the extensions like.bat or.exe etc. (separated by a comma or semicolon) and then click on the OK button to close the window. Close the Registry Editor window.

Reopen Outlook and check whether you can download the blocked attachments or not. You should be able to do so without encountering any error message. You can also adjust the level of security (Junk email filter settings) in Outlook so as to make it aware of a particular message’s behavior.

Additional Tips:

Check the registry key if you are not sure which Outlook version you have. If you are using Outlook 2003, it must be 11.0. For Outlook 2007, it is 12.0, while for Outlook 2010, it is 14.0. It is highly recommended that you don’t modify any other registry key in the Registry Editor. Wrong changes can lead to severe problems in your computer.

Check the list of the file types that Microsoft Outlook blocks. These include .ade, .adp, .app, .asp, .bas, .bat, .exe, .hlp, .inf, .hta, .isp, .jar, .der, .grp, .chs, .com, .cnt, .chm, .msi, .sct, and .wsc among others.

It is recommended that you scan all the files or attachments after downloading and saving them to your computer.

Article Source Link by Kumar Gandharva Jha