Since most operating systems don't have built-in support for 7z files, you'll need a third-party tool.
If you try to open and get an error saying the archive is "incomplete," it's very likely part of a multi-part set. Check the folder where you found it—you might need other files (like AL02.7z or AL03.7z ) in the same location for the software to put the pieces back together. AL01.7z
You can download the WinZip app on both Android and iOS to open these files on the go. Pro Tip: If the File Won't Open Since most operating systems don't have built-in support
The 7z format is popular because it often performs better than standard ZIP files: AL01.7z