en-US Home > Categories > Microsoft Excel 2016 > Excel Options > Security Security 91 Group Policy settings under Security. Browse the sub-folders and settings below. Sub-folders Cryptography (10) Trust Center (75) Settings Block Insecure Protocols in Excel Worksheet Functions Force file extension to match file type Perform file validation on pivot caches Scan encrypted macros in Excel Open XML workbooks Turn off file validation WEBSERVICE Function Notification Settings