: Be extremely cautious of where you obtained this file. Recent reports from Malwarebytes highlight that fake 7-Zip installers and files from unofficial sites like 7zip.com can infect PCs with Trojans or turn them into proxy nodes. Only trust 7z files from known, verified sources.
: This specific file is likely a standalone archive. However, if you see files ending in .7z.001 , .7z.002 , etc., it means the archive has been split into parts ; you would need all parts in the same folder to extract them. How to Open and Review Contents HL_01_20.7z
“7-Zip install and tutorial: The best free file archiver you'll ever need” YouTube · Mr. Sujano · 5 years ago : Be extremely cautious of where you obtained this file
: Once open, look for a readme.txt or manifest file within the folder, which usually contains a version history or description of the "HL_01_20" build. : This specific file is likely a standalone archive