What kind of file do you want to transfer? And to what kind of device do you want to send to? NFC_URI_FILE is only used to set the type of URI link sendt over NFC, when encoding an NFC NDEF URI message.
You should be able to define your own NFC Data Exchange Format (NDEF) to transfer images as binary data, but we don't provide any examples for this. You can study the predefined NDEF messages found in our SDK, to get an idea of how this is done.
You can find the complete API documentation for the NFC libraries in the infocenter.
