"Extract Here" (or similar) using your extraction software.
To open this file, you will need software that can handle multi-part RAR files, such as WinRAR (Windows), 7-Zip (Windows/Linux), or The Unarchiver (macOS) [1]. Steps to Use This File: BlackChristmas1974-alE13.part01.rar
Because it is named "...part01.rar", this means there are multiple files (part02, part03, etc.) [1]. You must download all parts for the archive to function properly [1]. "Extract Here" (or similar) using your extraction software
This is almost certainly a digital copy of the classic 1974 horror movie Black Christmas [1]. such as WinRAR (Windows)