In media and broadcasting, a "long feature" is a detailed story or enterprise report that typically exceeds a standard news segment length, such as those longer than 8 minutes in The Emmy Awards categories.

The ".rar" extension indicates that it is a compressed archive file containing the primary document or supporting data for the specified academic work. What's New in News & Documentary? - The Emmys

In the repository where the file was found, it may serve as a metadata tag for a comprehensive research article or "feature story" that provides more depth and context than a brief factual report.