This indicates a 7-Zip compressed archive file. It uses high-compression ratios to make large files smaller for easier transfer.
Depending on where you downloaded it from, it likely contains a collection of files (images, documents, etc.) rather than a single file. How to Open LBC1.7z LBC1.7z
If you get an error while extracting, the download likely did not finish properly. Delete it and download it again. This indicates a 7-Zip compressed archive file
Only open .7z files from trusted sources to avoid malware. How to Open LBC1
This is the specific label given to this archive (e.g., perhaps "Library Collection 1" or "Location Batch 1").
Use The Unarchiver , a free tool from the Mac App Store that handles .7z files easily.
Use file manager apps like RAR or ZArchiver to extract the contents. Troubleshooting & Tips