Given the format and structure of "fc2ppv329234314kpart04rar", it seems like it could be part of a larger set of files (possibly a video series or a large data set) split into multiple parts for easier distribution. "FC2PPV" suggests it might be related to a service provided by FC2, which could be hosting or distributing the content.
7‑Zip is open‑source, fast, and handles most RAR archives (including multi‑part) without needing a license. However, for very recent RAR5 archives you may need the official WinRAR/ rar command line for full compatibility. fc2ppv329234314kpart04rar upd