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This PowerShell script allows you to batch convert legacy Microsoft Office files (.doc and .xls) to their modern counterparts (.docx, .xlsx, or .xlsm for macro-enabled files)

There was an error while loading. Please reload this page. Office File Converter: Batch Convert .doc and .xls Files to .docx, .xlsx, or .xlsm (with Macro Support ...
GitHub

ods-files

XLSX to ODS is an online tool that converts documents created in Microsoft Excel(XLS/XLSX) or other spreadsheet processing formats into ODS (Operational Data Store) files.