the required parts
To extract a RAR file, such as the "fc2ppv4519169part13rar" file, follow these steps:
A RAR (Roshal ARchive) file is a type of compressed archive that uses the RAR algorithm to reduce the size of one or more files. RAR files are commonly used to distribute large files, such as videos, software, or collections of files, over the internet. They can be extracted using specialized software, such as WinRAR or 7-Zip.
这个看似随机的字符串，其实可以拆解为几个有特定含义的部分：
fc2ppv4519169part13.rar Description: 13th segment of a split RAR archive containing the FC2 pay‑per‑view video [Title] (ID 4519169). The archive was created for personal backup of a legally purchased copy. All 15 parts ( part01.rar ‑ part15.rar ) must reside in the same directory before extraction. Extraction steps: Use WinRAR/7‑Zip to open part01.rar and extract. Ensure the complete set of parts is present; otherwise the extraction will abort. Legal note: This archive is for personal, non‑commercial use only. Redistribution of any part of the video is prohibited by copyright law.
7z x fc2ppv4519169.part01.rar -o/path/to/output/folder