: The .7z extension indicates a 7-Zip compressed archive . These are used to group multiple files into one smaller, often encrypted, container.
.7z format specification — py7zr – 7-zip archive library GEN100MB15807.7z
: You can use the 7-Zip File Manager or WinZip to "look inside" the archive without fully running any executable files it might contain. GEN100MB15807.7z