: Use a tool like WinRAR or 7-Zip .
The file is one piece of a multi-part compressed archive, likely a "repack" of The Sims 4 distributed by the group DODI Repacks . Because large games are often split into smaller "parts" for easier downloading, you cannot use this file by itself; it must be combined with all other parts (e.g., part1 through part16 and beyond) to extract the actual game data. How to Handle Multi-Part RAR Files DODISIMSHISCOOL.part17.rar
: Right-click only on part01.rar and select "Extract Here". The software will automatically find part 17 and all other related files to assemble the complete package. : Use a tool like WinRAR or 7-Zip