How to associate iPhone application with _every_ file type?

Question

There is iPhone app \"Another Mail Client\" that should be able to open any file to send it as attachment. So, I want to associate this application with any file with any extens

Answer 1

I've made an app with the following setup

CFBundleDocumentTypes

    
        CFBundleTypeIconFiles
        
        CFBundleTypeName
        name
        LSItemContentTypes
        
            public.data
        
    

When I try to open a .pdf from Safari, this app shows up in "open in.." list. Can you make a sample app and try it?

UPD:

It seems like claim 'public.data' (tried also public.item, public.content) means file, which belongs to set "all known to system UTIs", not any file. So, you will be able to handle 99% of files, which users want to send by email , but not all. Another way would be to export UTI that you think are important, but which are not in system UTIs by default.