You can use 7-Zip on any computer, including a computer in a commercial organization. You don't need to register or pay for 7-Zip.
Native archive utilities often support 7z, or you can use WinRAR and Unarchiver. ClassNotes01.7z
Because 7z files can bundle multiple items—including executable scripts—users should scan the archive with antivirus software before opening, especially if the source of the "ClassNotes" is unverified. You can use 7-Zip on any computer, including