The CIF file is correctly formatted, and should be possible to open in ATK 11.8. It opens fine in 12.8 and 12.2. I don't have 11.8 installed however, since it's unsupported after the release of ATK 12.2.
You should be able to open it just like you did, by dropping it on the Builder, or using Builder 2012 where you click "Add" then select "Add From Files" and open the file this way (choosing the CIF file filter).