Security Warning for unsafe files must be set to prompt (Internet zone).

From Microsoft Internet Explorer 10 Security Technical Implementation Guide

Part of DTBI820 - Programs and unsafe files - Internet

SV-45306r1_rule Security Warning for unsafe files must be set to prompt (Internet zone).

Vulnerability discussion

This policy setting controls whether or not the "Open File - Security Warning" message appears when the user tries to open executable files or other potentially unsafe files (from an intranet file shared by using Windows Explorer, for example). If you enable this policy setting and set the drop-down box to Enable, these files open without a security warning. If you set the drop-down box to Prompt, a security warning appears before the files open. If you disable this policy these files do not open. If you do not configure this policy setting, the user can configure how the computer handles these files.

Check content

Fix text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Internet Zone -> "Show security warning for potentially unsafe files" to "Enabled", and select "Prompt" from the drop-down box.

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