The Save commands default file format must be configured.

From Microsoft Excel 2016 Security Technical Implementation Guide

Associated with: CCI-000381

SV-85635r1_rule The Save commands default file format must be configured.

Vulnerability discussion

This policy setting controls the default file format for saving workbooks in Excel. If you enable this policy setting, you can set the default file format for Excel from among the following options:- Excel Workbook (.xlsx). This option is the default configuration in Excel 2016.- Excel Macro-Enabled Workbook (.xlsm)- Excel Binary Workbook (.xlsb)- Web Page (.htm; .html)- Excel 97-2003 Workbook (.xls)- Excel 5.0/95 Workbook (.xls)- OpenDocument Spreadsheet (*.ods). Users can choose to save workbooks in a different file format than the default. If you disable or you do not configure this policy setting, Excel saves new workbooks in the Office Open XML format with an .xlsx extension.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2016 -> Excel Options -> Save "default file format" to "Enabled: (Excel Workbook *.xlsx)".

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