Digital "scares" often rely on the curiosity of the user. If the source of the link is anonymous or suspicious, it is safest to delete the file. Cultural Legacy
The "Ever Seen A Cat" meme fits into a broader category of internet lore where mundane subjects (like pets) are recontextualized into horror. This style of digital folklore is similar to "creepypastas" or ARG (Alternate Reality Game) elements found in communities like LiveJournal or early web forums. RAR!!! - LiveJournal Ever.Seen.A.Cat.rar
If you must open it, do so within a virtual machine or "sandbox" environment to prevent any potential scripts from affecting your main operating system. Digital "scares" often rely on the curiosity of the user