Replace application document with a cydia package

[Sziky]

Hi!
I want to create a cydia package, wich replaces a document of an installed application, but as i know, the application folder's name isn't the same always. How can i replace the file then?
For example i want to replace one of the files in the facebook application's documents folder, how can i do that?
Sorry for my english.

[Goof]

Why would you want to do that? The application will just crash


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[Sziky]

I just want to patch some files, not exactly the facebook' s files, it will not crash, the facebook was just an example.

[Sziky]

Any ideas? There are alradye some packages like this, for example angry birds patch, etc.