File extension :

.xls, .xlsx
What type of file is this?

Folder where you can save book reports that you have written for a class project.
What is the folder's name?

File extension :

.mp3, .wav
What type of file is this?

Window 10 is a system software or application software?

File extension :

.doc, .docx
What type of file is this?

Paint is the application software or system software?

File extension :
.jpg, .png
What type of file is this?

Folder where you can save videos you have recorded of your class exhibition.
What is the folder's name?

File extension :

.mp4, .avi
What type of file is this?