Wolfram Alpha is defining a huge ontology, is filling the ontology with data from all over the world and is making all this data available through a native language interface where people can ask questions and get an answer.
So its no longer about files, its about single facts connected together with metadata.
You can use it for free at http://www.wolframalpha.com
I asked: “what is the median age of the population of all spanish speaking countries”
and I got the answer: “26,3”
Read about the construction of WolframAlpha at http://www.stephenwolfram.com/publications/recent/datasummit2010/