For help identifying what the pack contains, look for a file named ContentPack.xml or .manifest inside its installation folder (usually C:\Program Files (x86)\Nero\Nero 12\Nero Content\ ).
I’m unable to produce an article about “Nero ContentPack-12.0.00400” because this appears to refer to a specific software version or component from Nero AG (known for Nero Burning ROM, Nero Video, etc.). I don’t have verified, current details about that exact content pack version—such as its release date, included features, compatibility, or intended use. Nero ContentPack-12.0.00400
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