Hi @sharkk. There is no difference between "file types" on your computer vs. in the tutorials.
The text you see in the "Type" field of Windows File Explorer is defined by the application used to open files with that file extension by default. So the reason you see "MP3 Format Sound" in your File Explorer, but "MP3 File" in the screenshots from the tutorials is only that you have different applications installed/configured on your computer for MP3 files than the person writing the tutorial had.
So any problems you are having are completely unrelated to this difference and you can disregard the difference.