The pin is for the pairing process, the PC and PB shouldn't have a preset one, you just type the same one on both when prompted.
The BT connection in setting isn't for file-transfer its for Internet access and wouldn't have a chance of working as is unless the other device is a Bluetooth access point or a mobile with a data plan and even then I'm not sure if it works since i couldn't test it but observed its designed right now for those two options.
File transfer is basically detecting the object-push/transfer is available on the device from the PC and sending a file to it (might need to pair the two first).
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