Office Outlook Security
When Office Outlook downloads attachments with e-mails, it should generally not be possible to open certain types of files. If this is not the case, harmful scripts and viruses could be unintentionally activated. Under Blocked file types, you can see a list of all file types that cannot be opened in Outlook. You can disable the blocking of individual file types by clearing the check box in front of them, or you can click Block None to allow the opening of all file types.