About bat batch file

Focus Windows directory to save wallpaper:

window + R> Copy the following path> Enter

%localappdata%\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets

== replace suffix all files in the same directory as .jpg
REN *. * * .jpg
 == put under the same directory as the file extension .jpg suffix replace .txt
REN * .jpg * .txt
 == suffix .txt file suffix removed under the same directory
ren *.txt *.