: A high-compression archive format. You would need a tool like 7-Zip or WinRAR to open it.
Files with this specific naming convention are frequently found in communities dedicated to niche interactive fiction or adult-themed visual novels. If you found this in a download folder or archive, it is usually a standalone game folder or a patch meant to be dropped into a game's directory to change the language to English. Vicious_circle_Lin_EN.7z
: Indicates that this is the English language version or a fan-made translation patch. : A high-compression archive format