Download and export AB sc_ref and sc_sample data

[Kirkanoi]

Hi,
I'm a spectroscopist and not an expert in R langage. I can download OPUS files, but no way for extracting single scanes and AB spectra from the list object.
May I ask some help here? I mean a few lines of code for extracting and saving as text/ASCII files the following:

• spectrum "AB" with atmospheric compensation
• spectrum "AB" without atmospheric compensation
• sc_ref
• sc_sample

Another option would be to extract information from the OPUS binary file, using Igor or Python. But I don't know how to read this file?

Thanks by advance.