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Common Office File Extensions & Compatibility

Introduction

File extensions indicate the type of file and the application required to open it. In MS Office-related exams, questions on file extensions are extremely common because they test basic computer awareness used in daily office work.

This pattern is high-frequency and easy scoring, often appearing as direct one-liners in banking and insurance exams.

Pattern: Common Office File Extensions & Compatibility

Pattern

The key idea is to correctly identify the file extension associated with MS Word, Excel, PowerPoint, and other Office-compatible formats, along with understanding which applications can open them.

Step-by-Step Example

Question

Which of the following file extensions is primarily associated with MS Excel?

  • A. .docx
  • B. .pptx
  • C. .xlsx
  • D. .txt

Solution

  1. Step 1: Identify the application

    The question asks for the file extension used by MS Excel.

  2. Step 2: Recall common Office extensions

    • .docx → MS Word document
    • .pptx → MS PowerPoint presentation
    • .xlsx → MS Excel workbook
    • .txt → Plain text file

  3. Step 3: Match the correct extension

    MS Excel files are saved with the .xlsx extension.

  4. Final Answer:

    .xlsx → Option C

  5. Quick Check:

    Opening a .xlsx file launches MS Excel by default ✅

Quick Variations

• MS Word document → .doc / .docx

• MS PowerPoint presentation → .ppt / .pptx

• Excel-compatible data file → .csv

• Plain text file → .txt

Trick to Always Use

  • Step 1 → First identify the application name mentioned in the question.
  • Step 2 → Map application to extension:
    • Word → .docx
    • Excel → .xlsx
    • PowerPoint → .pptx
    • Data exchange → .csv

Summary

Summary

  • File extensions identify the application used to open a file.
  • .docx, .xlsx, and .pptx are standard MS Office formats.
  • .csv files are Excel-compatible and used for data exchange.
  • Extension-based questions are direct and high-frequency in exams.

Example to remember:
Word → .docx | Excel → .xlsx | PowerPoint → .pptx

Practice

(1/5)
1. Which file extension is used for saving an MS Word document in the newer Office versions?
easy
A. .docx
B. .xlsx
C. .pptx
D. .txt

Solution

  1. Step 1: Identify the application

    The question asks about MS Word.

  2. Step 2: Recall Word file formats

    Modern versions of MS Word save files as .docx.

  3. Final Answer:

    .docx → Option A.

  4. Quick Check:

    Double-clicking a .docx file opens MS Word by default ✅
Hint: Word document = .docx.
Common Mistakes: Confusing .docx with Excel or PowerPoint extensions.
2. Which of the following file extensions is primarily associated with MS PowerPoint?
easy
A. .xlsx
B. .pptx
C. .docx
D. .csv

Solution

  1. Step 1: Identify the application

    The question refers to MS PowerPoint.

  2. Step 2: Recall presentation file formats

    PowerPoint presentations are saved as .pptx.

  3. Final Answer:

    .pptx → Option B.

  4. Quick Check:

    .pptx files open directly in MS PowerPoint ✅
Hint: Presentation file = .pptx.
Common Mistakes: Choosing .xlsx which belongs to Excel.
3. Which file format is commonly used to store spreadsheet data in a text-based, Excel-compatible form?
easy
A. .ppt
B. .doc
C. .csv
D. .pdf

Solution

  1. Step 1: Identify the requirement

    The file should be text-based and Excel-compatible.

  2. Step 2: Recall data exchange formats

    .csv stores data using comma-separated values.

  3. Final Answer:

    .csv → Option C.

  4. Quick Check:

    .csv files open easily in MS Excel for data analysis ✅
Hint: Data exchange with Excel = .csv.
Common Mistakes: Assuming .pdf files are editable spreadsheets.
4. Which file extension represents a plain text file that can be opened by MS Word and Notepad?
medium
A. .docx
B. .pptx
C. .xlsx
D. .txt

Solution

  1. Step 1: Identify the file type

    The file contains only plain text.

  2. Step 2: Recall text file formats

    .txt files store unformatted text.

  3. Final Answer:

    .txt → Option D.

  4. Quick Check:

    .txt files open in Notepad and MS Word without formatting ✅
Hint: Plain text file = .txt.
Common Mistakes: Expecting formatting in a .txt file.
5. Which MS Office application primarily opens files with the extension .xls?
medium
A. MS Excel
B. MS Word
C. MS PowerPoint
D. MS Access

Solution

  1. Step 1: Identify the extension

    The extension given is .xls.

  2. Step 2: Recall older Office formats

    .xls is the older Excel workbook format.

  3. Final Answer:

    MS Excel → Option A.

  4. Quick Check:

    Opening an .xls file launches MS Excel automatically ✅
Hint: Old Excel format = .xls.
Common Mistakes: Assuming .xls is a Word document.

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