How to Turn on File Extensions 

🖥️ Windows (Windows 10 / 11)

1. Open File Explorer.

2. Click the View tab at the top (Windows 10)

3. In Windows 11, click View → Show.

4. Check the box labeled File name extensions.

✅ File extensions (like .docx, .jpg, .pdf) will now appear at the end of all file names.

🍎 Mac (macOS)

1. Click the Finder icon in the Dock.

2. In the top menu, click Finder → Settings (or Preferences on older versions).

3. Click the Advanced tab.

4. Check Show all filename extensions.

✅ All file extensions will now be visible in Finder.

💻 Chromebook (ChromeOS)

1. Open the Files app.

2. Click the three dots (⋮) in the top-right corner.

3. Turn on Show file extensions.

✅ Extensions will now appear next to each file name.

✅ Why This Matters

• Helps you identify file types correctly

• Prevents accidentally opening the wrong file

• Important for submitting assignments in the correct format

This content was generated in CoPilot and then tested by Prof. Noone.  This is an example of how I am citing this AI use: 

Microsoft. (2026, June 11). Instructions for showing file extensions in Windows, macOS, and Chromebook [ChatGPT (GPT-5) response]. M365 Copilot.