Because it ends in .rar , the file is a compressed package. To see the contents, you must first extract it using third-party software, as most standard operating systems do not support RAR files natively. How To Open RAR Files On Windows(Extract)
"D04.rar" is typically a compressed archive that contains files. These files store drill information used in OrCAD PCB Designer, a software developed by Cadence Design Systems. Opening the Archive D04.rar