"Uni-Tree" is file management system based on a new theory called "Dynamic-Set-Directory" or "HyperTree-Directory". Compared with file management system adopting traditional directory tree, it has some advantage as follows.
(1)Dynamic  "path":
In Uni-Tree,you can get your files by dynamic combination of multi-category the files belong to. So there are no fixed-path idea in Uni-Tree.
(2)Free file format:
Uni-Tree can support any file format supported by OS, because the files managed by Uni-Tree is not stored in a unitive database, but stored in file system of OS. In a manner ,Uni-Tree like a shell of file system of OS. This is why Uni-Tree can support any file format OS can.
(3)Function of relative-query-guide:
Sometime if you can only remember small parts of categories the files belong to, you can use this function to reduce searching range until you find the files you need with  the categories you know as beginning.
(4)Item property:
In some cases, the file has some continuing attributes result that it can not be pigeonhole and got adopting a group of scattered categories conveniently. In Uni-Tree you can use item properties to do this.