What is the file extension
What is the file extension for a standard, macro-free Excel workbook created in versions 2007 and later?
Answer by Discover Talent
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.xlsx (Standard Workbook): The default extension for Excel files created since version 2007. The 'x' stands for XML (referring to the underlying file structure) and, importantly, indicates the file does not contain any Visual Basic for Applications (VBA) code or macros. This is generally the safest file format.
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