Some online courses or textbooks label exercise files as "EX(01)", "EX(02)", etc. [1, 2].
Generic names like "EX(01)" are frequently used by automated scripts to spread viruses or "browser hijackers" [3, 4]. Download EX(01) rar
Never download a second program that claims to "unlock" or "provide the password" for the archive. Some online courses or textbooks label exercise files