File: In.nightmare.zip ... Here

: If you run the file and your computer begins to slow down or shows unexpected pop-ups, disconnect from the internet immediately and run a full system scan.

: Before extracting, upload the file to VirusTotal to check it against dozens of antivirus engines.

The file is frequently associated with a horror-themed indie game or a fan-made project, often distributed through platforms like Itch.io or community forums.