User Input: The script now prompts the user to input the directory where the files are located and the file extension they want to modify. This allows the user to specify the directory and extension interactively.
Delayed Expansion: setlocal enabledelayedexpansion is used to enable delayed variable expansion. This is necessary when using variables inside loops or conditionals.
Target Definition: The set command is used to define the target variable, which holds the pattern for the files to be processed. It combines the user-specified directory and extension to form the search pattern.
Validation: There's a check to ensure that files with the specified extension exist in the specified directory. If no matching files are found, it informs the user and exits the script.
Processing Loop: The for /r loop is used to recursively search for files matching the specified extension within the chosen directory. For each matching file, it renames the file by replacing the original extension with .jpg.
User Message: After the modification is complete, it displays a message to let the user know the process has finished.
Pause and Exit: It waits for the user to press any key before the script exits, allowing the user to review the output messages.