How to make VS Code to treat other file extensions as certain language?

Question

Or is there a way to switch the current file\'s language to use syntax highlight feature?

For example, *.jsx actually uses JavaScript but VS Code doesn\

Answer 1

Hold down Ctrl+Shift+P (or cmd on Mac), select "Change Language Mode" and there it is.

But I still can't find a way to make VS Code recognized files with specific extension as some certain language.