Make bulk changes using the Python file suffix
Code
import os
files = os.listdir('.')
for file_name in files:
portion = os.path.splitext(file_name)
if portion[1] == ".jpg":
new_name = portion[0] + ".gif"
os.rename(file_name, new_name)
The above code is the suffix "jpg" files into the suffix "gif" files.
Instructions
The python file containing the code above change.py
copies you want to change the file extension to a folder, open the cmd command line, enter the following command.
python change.py