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AssetDatabase.IsForeignAsset

public static bool IsForeignAsset(Object obj);
public static bool IsForeignAsset(int instanceID);

Description

Determines whether the Asset is a foreign Asset.

A foreign Asset is a file produced externally to Unity that's imported into a Project (for example, a .png Texture file is a foreign Asset).
Upon importing a foreign Asset, Unity will produce a serialized representation of the data in the Project's Library folder. This is done when the Asset is first added to the Project and when the foreign Asset is updated externally to Unity.

See Also: AssetDatabase.IsNativeAsset