MD5 files are checksum files that ensure the downloaded archive (TAR) files were not damaged during transfer. To use MD5 to verify the download follow these steps:
It should return "OK". Any other response indicates a corrupted file and you will need to transfer the files again to the /tmp folder.
Check the md5sum in Windows
You must use an application to use the downloaded files checksum using the md5. There is more than one available for free on the internet.
Use the one you prefer and follow its instructions on how to use it.