Based on general file structure for such downloads, here is what you need to know: File Function
This is the 9th part of a multi-part RAR archive. These files are split into smaller chunks (often 5GB or 500MB) to make downloading easier on varied internet connections. Gr0nded [DODI Repack].part09.rar
The file is part of a split compressed archive for a game repack. Based on general file structure for such downloads,
Ensure you have downloaded every part of the set (part01, part02, etc.). Gr0nded [DODI Repack].part09.rar