How to batch change file extensions in win10

Huanjing ：

Win10 pro 1904

Problem description ：

CMD How to batch change file extensions

Solution ：

1. stay CMD Window type cd Copy the file path to rename the extension , Then click enter

2. Input ren *. Existing file extensions *. Extension to change to

 for example ： ren *.CHK *.JPG   hold CHK The format file is changed to JPG Format , Click enter 

3. complete