Use the below code
Process.Start("explorer.exe", System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments));
Process.Start("explorer.exe", System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyComputer));
Process.Start("explorer.exe", System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyPictures));
Thanks
--RA