The file name you provided is a standard release tag from the digital piracy/sharing scene:
: The story is set in Northern England during World War II, specifically in the period leading up to the D-Day invasion, as thousands of American soldiers ("Yanks") are stationed in small British towns.
: The source is a high-definition Blu-ray disc , compressed to 720p resolution.
If you are looking to watch the film through official channels, it is available for purchase or rental on platforms like Google Play and Amazon Prime Video. Yanks (1979) – BluRay Review - Set The Tape
: This indicates the video was encoded using the H.264/MPEG-4 AVC standard.