To change the default program used to open a specific file type, follow these steps:

1. Open Command Prompt.
2. Type in assoc, followed by a space and then the file type you want to change the default program of (e.g. assoc .txt).
3. Type in ftype, followed by a space and then the same file type followed by a = sign and the file path to the program that you want to use as a default to open that file type. (e.g. ftype .txt = notepad.exe).