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To solve this problem, you need to turn off the Windows Firewall.
If you received the error message: ERR INAVLID FILE while trying to convert an audio file this is because the audio file is not supported, the most common reason is not because of the audio type used but because of file encryption. If the audio file came from an online store such as iTunes, iMesh etc the use DRM encryption methods to intentionally prevent you from being able to convert or distribute the files.