if you want to burn CDI images using Nero, just try CDI2NERO.exe with the original .CDI file you've.

Don't extract all the files to rebuild the image. Just convert the original .CDI to .NRG using CDI2NERO

Also, you can try loading the .CDI using Daemon Tools and then just do a CD-to-CD copy in Nero. (source drive: virtual drive; destination drive: your burner)