.7z (7-Zip). This is a high-compression archive format. You will need 7-Zip or WinRAR to open it.
Look for a README.txt or .md file inside the archive; that will list the specific features and installation instructions intended by the creator. Zoo - 14-8-2022 02-25-14.7z
If this is for a game like Zoo Tycoon or Planet Zoo , "complete feature" usually refers to a version where all custom assets, scripts, and compatibility fixes are pre-packaged and ready to run. Zoo - 14-8-2022 02-25-14.7z