This question obviously applies to not only mathematics, so maybe I should post it on academia.SE or somewhere else; but then again, mathematical literature has its own specifics related to existing sources of mathematical data on MR, Zentralblatt, arXiv, etc., so I still decided to post it here.
I've got, by now, around 4gb of various mathematical texts in electronic form (pdf, djvu, ps files of papers, books, talk slides, etc.). Clearly I try to keep them under control by sorting them out in subfolders, but sometimes it is hard to figure out where a specific file belongs. So it would be extremely helpful to use some existing classification like the AMS one. Even if none of the existing classifications suits my tastes completely, it is very convenient to use choices made by somebody else already instead of thinking about such choice everytime by myself.
Does anyone know any existing software that would facilitate such a thing? That is, given 4gb of files, look up the titles, tie them to some online classification source, and create a searchable queryable (?) database.