Given the structure of the file name, here are a few possible scenarios:
: This is a compressed archive format created by WinRAR. It is used to reduce file size and bundle multiple files together. FC2-PPV-2364487.part5.rar
: This prefix is commonly associated with a Japanese content marketplace where independent creators share video media. Given the structure of the file name, here
: You cannot open "part5" by itself. To extract the video, you must have all parts (part1, part2, etc.) in the same folder and use software like WinRAR or 7-Zip to extract from the first volume. you must have all parts (part1