In the age of the internet, file extensions are a good idea, they should be visible by default, and people need to learn to recognize them. There's a lot of mal

In the age of the internet, file extensions are a good idea, they should be visible by default, and people need to learn to recognize them. There's a lot of malware that gets people to run it by being an executable with an icon of an innocent file type, like an image. If you don't see extensions, you have no idea it's an .exe instead of a .jpg.