A proprietary archive file format that supports data compression, error recovery, and file spanning [1].
You will need a file archiver tool, such as: RAD-CODEX.part1.rar
The official software for creating/extracting .rar files. 7-Zip: A free, open-source alternative. A proprietary archive file format that supports data
Right-click only the RAD-CODEX.part1.rar file and choose "Extract Here" or "Extract to..." using your software. The tool will automatically detect the other parts and combine them [2]. Important Safety and Security Notes RAD-CODEX.part1.rar
Disclaimer: This information is for educational purposes regarding file types and compression. Accessing or downloading pirated content is illegal.