The "(7)" suffix suggests this is a duplicate download or one in a series of similar files.
You can simply right-click the file and select Extract All... to unzip it without extra software. t (7).zip
It likely contains one or more documents, images, or data files compressed to save space or for easier sharing. Management & Extraction Guide The "(7)" suffix suggests this is a duplicate
If the file is encrypted, you will need the specific password provided by the creator to view the contents. t (7).zip