You cannot extract part4.rar on its own. You must have all other parts (e.g., part1.rar , part2.rar , part3.rar , etc.) in the on your computer.
Ensure all parts are in the exact same directory and named identically aside from the part number. STW4SH5TR45J3D-PL4K.part4.rar
The filename STW4SH5TR45J3D-PL4K appears to be an or a Scene Release tag (the suffix -PL4K often refers to specific release groups). If this is a game or software, once extracted, look for a .exe setup file or an .iso disk image inside the resulting folder. You cannot extract part4
This usually means one of the parts (likely part4 in your case) didn't download correctly. Delete the file and download it again. The filename STW4SH5TR45J3D-PL4K appears to be an or
The software will automatically pull data from part2 , part3 , and your part4 file to reconstruct the original content.