Knowledge.rar - 04

Because Windows and macOS do not always support .rar files natively, you will need a third-party "unarchiver" or "extractor":

If you received "04 Knowledge.rar" from the internet or an unknown source, follow these precautions before opening it: Need to open, create, or convert a RAR file? - WinZip 04 Knowledge.rar

The filename suggests it is part of a numbered series (e.g., "04") within a larger collection of data. Because Windows and macOS do not always support

: Based on the name "Knowledge," it most likely contains documents, PDFs, videos, or course materials related to a specific subject, training module, or database. How to Access the Contents " it most likely contains documents

: A common choice for Mac users to extract compressed files. Safety and Security Tips