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I use my Neuros for business and record many lectures, presentations, etc. using the built-in microphone (like you would a handheld cassette/recorder). Most of the recordings are MP3 files and playback fine. However, I have had several recordings that listed the following file extentions: MPO, MP1 and MP2. As I said, these are recordings I have made myself and not external files downloaded from another source.
What causes this to happen and can it be controlled?
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