Patched code sample

import subprocess

def get_command_and_args_secure(file_path: str):
    """
    Securely prepares a command and its arguments as a list.

    Instead of embedding the file path into a command string, this function
    constructs a list of arguments. The file path is treated as a single,
    distinct argument, preventing shell metacharacters within the path from
    being interpreted by a shell. This is the core principle of the fix.
    """
    # On Windows, Pillow's viewer uses 'mspaint.exe' to display images.
    # The command and its argument (the file path) are separate items in a list.
    return ["mspaint.exe", file_path]

def show_image_fixed(file_path: str):
    """
    Executes a command to show an image, preventing command injection.

    This function calls subprocess.Popen with a list of arguments and the
    default shell=False. The operating system handles the creation of the
    new process, ensuring that the file_path is passed as a single, literal
    argument to mspaint.exe, without any shell interpretation.
    """
    # Get the command and arguments as a safe list.
    args_list = get_command_and_args_secure(file_path)

    # Execute the command securely. No shell is used.
    subprocess.Popen(args_list)