Computer Science for IGCSE & O level - Software (Section 7 - No. 10)
What is the primary function of a file extension?
To determine the size of the file.
To identify the type of file and the program that should be used to open it.
To store the file's content.
To identify the owner of the file.
Explication
File extensions are used to recognize file types and determine which application to open it with.