I'm not sure what you're looking for, but I can tell you that the text you provided appears to be a filename, specifically a part of a video file that has been split into multiple parts.
The handling of files like FC2PPV-3620789-2-4K.part10.rar requires a basic understanding of file compression and sharing practices. While this write-up doesn't dive into specifics about the content of the mentioned file, it aims to provide a general guide on dealing with similar files and the considerations that come with file sharing and downloading. FC2PPV-3620789-2-4K.part10.rar
If you receive a "Checksum Error" or "Unexpected End of Archive," it usually means one of the parts (possibly part 10) was corrupted during download. Technical Specifications of 4K FC2 Content Content labeled as 4K on FC2 typically features: Resolution: 3840 x 2160 pixels. I'm not sure what you're looking for, but