Multiple choice

Which of the following is the extension of a Microsoft Excel file?

  1. file.exe

  2. file.doc

  3. file.xlf

  4. file.xls
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The .xls extension is the traditional file format for Microsoft Excel workbooks, used in Excel 97-2003. While modern Excel uses .xlsx as the default format (introduced in Excel 2007), .xls files are still widely recognized and can be opened in current Excel versions with compatibility mode. Options A (.exe), B (.doc), and C (.xlf) are incorrect - .exe is for executable programs, .doc for Word documents, and .xlf for translation interchange files.

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