What is "stringImportPaths"

[mrphobby via Digitalmars-d-learn]

Can anyone explain what "stringImportPaths" is? I have seen this 
being used in dub.json files and I think I kind of know what it 
does, but I haven't been able to find a clear explanation in any 
documentation of what it does. It does not look like anything I'm 
familiar with from other languages.

I understand it can be used for resources but I have seen it 
being used with both text files and binary files so I'm a bit 
confused. The documentation says I can import "whatever", but 
that feels a bit weird since importing is a construct used for 
importing symbols, right?