Final answer:
To find extension mismatch files in a given .dd file, you can use the 'find' command in Unix-based systems.
Step-by-step explanation:
To find extension mismatch files in a given .dd file, you can use the command-line tool 'find' in Unix-based systems. Here's an example interface:
find /path/to/file/ -type f -not -name '*.*'
This command searches for all files in the specified directory that do not have an extension. The result page will display a list of files with their details, such as file name, size, and modification time.