Computer Basics: Files, Folders, Keyboard Shortcuts

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For a grown-up: Claude is for adults (18+). Copy this, paste it into Claude, and use the answer to explain the lesson to your child.

I'm learning "Computer Basics: Files, Folders, Keyboard Shortcuts" on The Future Market. Lesson 1: "Files, folders and extensions".

What the lesson teaches:
- A file holds one thing: a document, photo, song or app. A folder holds files and other folders.
- A file name has a base name and an extension, separated by a period: essay.docx.
- Common extensions:
- Extension - What it is
- .docx - Microsoft Word document
- .xlsx - Microsoft Excel workbook
- .pptx - Microsoft PowerPoint presentation

The exercise I'm working on:
Turn on file extensions on your computer. Find one .docx, one .pdf and one .jpg file.

I'm stuck. Please:
1. Explain the main idea in plain, simple words with one everyday example.
2. Walk me through the exercise one small step at a time. Ask me what I've done so far before giving the next step.
3. Don't just give me the final answer. Help me do it myself, and check my work when I share it.

I'm a parent helping my child (about 8 years old) with a lesson called "Files, folders and extensions" from the course "Computer Basics: Files, Folders, Keyboard Shortcuts".

Here's what the lesson says:
A file is like one drawing. A folder is like a binder that holds drawings. The little letters at the end of a file's name, like ".pdf", tell the computer what kind of drawing it is.

The activity:
Turn on file extensions on your computer. Find one .docx, one .pdf and one .jpg file.

Please explain this so an 8-year-old understands: short sentences, a fun everyday example, and no hard words.
Then give me 3 simple questions I can ask my child to check they understood, and a way to do the activity together, one tiny step at a time.