Duplicates mesh assets (Unity 4.x)

MeshDuplicator.cs

using UnityEditor;
using UnityEngine;

static class MeshDuplicator
{
    static Mesh[] SelectedMeshes { get {
        return Selection.GetFiltered<Mesh>(SelectionMode.Unfiltered);
    } }

    [MenuItem("Assets/Duplicate Mesh")]
    static void DoDuplicate()
    {
        foreach (var mesh in SelectedMeshes)
        {
            var src = AssetDatabase.GetAssetPath(mesh);
            var dir = System.IO.Path.GetDirectoryName(src);
            var dst = System.IO.Path.Combine(dir, mesh.name + ".asset");
            dst = AssetDatabase.GenerateUniqueAssetPath(dst);
            AssetDatabase.CreateAsset(Object.Instantiate(mesh), dst);
        }
    }

    [MenuItem("Assets/Duplicate Mesh", true)]
    static bool ValidateMenuItem()
    {
        return SelectedMeshes.Length > 0;
    }
}