The .part1.rar extension indicates that this file is incomplete on its own. You will need "CDRL-016.part2.rar" (and potentially more) in the same folder to successfully extract the contents using a tool like WinRAR or 7-Zip .
In various government projects, this specific ID has been used for: Warranty Process Flow Charts (U.S. Army). District Plans including maps and narratives (GovTribe). CDRL-016.part1.rar
RAR files from unknown sources are frequently used to distribute viruses or trojans. Do not run any .exe or .scr files found inside the archive. CDRL-016.part1.rar