Files in unsafe locations must be opened in Protected View.

From Microsoft Excel 2016 Security Technical Implementation Guide

Associated with: CCI-001170

SV-85651r1_rule Files in unsafe locations must be opened in Protected View.

Vulnerability discussion

This policy setting lets you determine if files located in unsafe locations will open in Protected View. If you have not specified unsafe locations, only the "Downloaded Program Files" and "Temporary Internet Files" folders are considered unsafe locations. If you enable this policy setting, files located in unsafe locations do not open in Protected View. If you disable or do not configure this policy setting, files located in unsafe locations open in Protected View.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2016 -> Excel Options -> Security -> Trust Center -> Protected View "Do not open files in unsafe locations in Protected View" to "Not Configured" or "Disabled".

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