Multiple choice

What is the extension of an Excel file?

  1. .txt

  2. .rft

  3. .xls

  4. .doc
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The traditional file extension for Excel files is .xls. This was used for Excel files from 1987 through Excel 2003. Starting with Excel 2007, .xlsx became the default for the new XML-based format, but .xls remains the classic extension.

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