Since .rar is a proprietary format, you need a decompression tool to access the contents.
While the exact contents vary, "gd_new" archives usually follow one of these patterns: gd_new.rar
: If you get a "Checksum error" during extraction, the download was likely interrupted. Delete the file and download it again. Since .rar is a proprietary format
Do you have a where you found this file so I can provide more detailed installation steps for that version? gd_new.rar
: Download and install WinRAR (official) or 7-Zip (free/open-source) [2].