If the registry key exists, go to step 5. Under Edit, click New, and then click Key.
For Outlooktype work on the Internet without attachments list For Outlooktype 9. Under Edit, click New, and then click String Value. Right-click the new string value name, and then click Modify. Type the file name extension of the file type that you want to open in Outlook. For example:. Click OK.
Restart your computer. When you start Outlook, open the file types you specified in the registry. Note We recommend that you enable only the file types that you have to have. If you rarely receive a particular file type, we recommend that you give Outlook temporary access to the file type that is in question.
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Then, reconfigure Outlook to block the file type by undoing the changes to the registry. For more information about how you can configure Outlook to block attachment file name extensions that Outlook does not block by default, click the following article number to view the article in the Microsoft Knowledge Base: How to configure Outlook to block additional attachment file name extensions Method 2: Configure Outlook in an Exchange environment If you run Outlook in an Exchange environment, the Exchange server administrator can change the default attachment security behavior.
For more information about how to configure Outlook in an Exchange environment, click the following article numbers to view the articles in the Microsoft Knowledge Base: Administrator information about e-mail security features Administrator information about the Outlook E-mail Security update: June 7, Attachment Behavior Attachments are divided into three groups based on their file name extension or file type.
Outlook handles each group in a specific way.
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Level 1 Unsafe The unsafe category represents any file name extension that may have script or code associated with it. You cannot open any attachment that has an unsafe file name extension. For a list of the unsafe file name extensions, see this Office support page. The following list describes how Outlook behaves when you receive or send an unsafe file attachment: You cannot save, delete, open, print, or otherwise work with unsafe files.
A message at the top of the e-mail message indicates that Outlook has blocked access to the unsafe attachment. The attachment is inaccessible from Outlook. However, the attachment is not actually removed from the e-mail message. If you forward an e-mail message that has an unsafe attachment, the attachment is not included in the forwarded e-mail message. If you send an e-mail message that contains an unsafe attachment, you receive a warning message that states that other Outlook recipients may be unable to access the attachment that you are trying to send.
You can safely ignore the warning message and send the e-mail message, or you can decide not to send the e-mail message.
In Outlookif you save or close an e-mail message that contains an unsafe attachment, you receive a warning message that states that you will be unable to open the attachment. You can override the warning message and save the e-mail message.
You cannot use the Insert Object command to open objects that are inserted in Microsoft Outlook Rich Text e-mail messages. You see a visual representation of the object. However, you cannot open or enable the object in the e-mail message.
You cannot open unsafe files that are stored in an Outlook or an Exchange folder. Although these files are not attached to an Outlook item, they are still considered unsafe. When you try to open the unsafe file, you receive the following error message: Can't open the item.
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Outlook blocked access to this potentially unsafe item. Level 2 Level 2 files are not unsafe.
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However, they do require more security than other attachments. When you receive a Level 2 attachment, Outlook prompts you to save the attachment to a disk.
You cannot open the attachment in the e-mail message. By default, file name extensions are not associated with this group. However, if you use Outlook with an Exchange server and your mail is delivered to an Exchange mailbox, the Exchange server administrator can add file name extensions to the Level 2 list.
Other Attachments When you try to open an attachment that has a file name extension other than those in the Level work on the Internet without attachments list or the Level 2 list, Outlook prompts you binary options for mobile either open the file directly or save it to a disk.
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You can turn off future prompts for that file name extension if you clear the Always ask before opening this type of file check box. Note If a program associates itself with a new file name extension, Outlook treats that file name extension as safe until you add the file name extension to the list of Level 1 or Level 2 file name extensions.
For example, if you install a program on your computer work on the Internet without attachments list uses files that have a. By default, the.
Therefore, Outlook treats it as a safe file name extension. If you want Outlook to treat attachments that have the.