Question:

Which file format is NOT supported by default in Microsoft Word?

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Word = .docx
Excel = .xlsx
PowerPoint = .pptx
Updated On: Jun 10, 2026
  • .docx
  • .pdf
  • .xlsx
  • .rtf
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The Correct Option is C

Solution and Explanation

Concept: Microsoft Word is a word processing application that supports a variety of document formats. However, certain file types belong to other Microsoft Office applications.

Step 1: Identify Word-supported formats. Common formats supported by Microsoft Word include:

• .doc

• .docx

• .pdf

• .rtf

• .txt

Step 2: Understand the .xlsx format. The extension:
is the default workbook format used by Microsoft Excel. It stores spreadsheets, formulas, charts, and worksheet data.

Step 3: Evaluate the options. .docx is Word's native format. .pdf files can be opened and exported by Word. .rtf is supported by Word. .xlsx belongs to Excel rather than Word.

Step 4: Conclusion. Therefore, .xlsx is not a default Word document format. Hence, option (C) is correct.
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