Use file manager apps like RAR or ZArchiver to extract the contents. Troubleshooting & Tips
Use The Unarchiver , a free tool from the Mac App Store that handles .7z files easily. LBC1.7z
"LBC1.7z" is a file name format often associated with compressed archives, frequently used for sharing sets of images, documents, or data. To help you manage this file, What is LBC1.7z? Use file manager apps like RAR or ZArchiver