: Usually denotes "Layout Version 4.0.0" or a specific "Level of Detail" version in engineering and CAD software.
To help you "prepare" this story further, I could use a bit more context: Is this file from a (like a mod or a map)? Is it an engineering or CAD file you're trying to describe? sc22787-LOv400.rar
: This often appears as a project code or serial number (sometimes seen in World Bank or engineering documents). : Usually denotes "Layout Version 4