md pdf_files music_files video_files zip_files exe_files txt_files image_files excel_files
xcopy *.pdf pdf_files
xcopy *.mp3 music_files
xcopy *.mp4 video_files
xcopy *.zip zip_files
xcopy *.exe exe_files
xcopy *.txt txt_files
xcopy *.jpg image_files
xcopy *.png image_files
xcopy *.xlsx excel_files