Microsoft Word Starter document changed to word pad. Why? Very confusing

[Gilmore]

After typing in the Microsoft Word Starter and got it saved, it changed into Word Pad which is not at all good. Why? Can this be prevented?

[Frinavale]

You can set up "File Associations" in Windows.
This means that you can tell Windows which application is used to open files of a specific type.

Check out this article for more information.

-Frinny