: This is a compressed archive format created by 7-Zip. You will need a tool like 7-Zip (Windows) or Keka (macOS) to "unzip" or extract it.
If there are questions about how to use extraction tools or media players in general, that information can be provided. lhisgreat.mkv.7z
Working with files downloaded from the internet requires caution. Here are some general points regarding these file types: : This is a compressed archive format created by 7-Zip