To view the contents or an "article-style" list of what is inside, you must use a compatible archiver:
: Sometimes used for large legacy software repositories. B_S_Giga.7z
: Right-click the file and select "Extract files...". To view the contents or an "article-style" list
Providing the source site could help me track down the specific community documentation or "article" for it. B_S_Giga.7z