[Unity] Hides meta files in Windows Explorer.

HideMetaFiles.cs

#if UNITY_EDITOR
using System.IO;
using UnityEditor;
using UnityEngine;

namespace Editor
{
    /// <summary>
    /// It runs after each assembly reload.
    /// </summary>
    [InitializeOnLoad]
    public class HideMetaFiles
    {
        static HideMetaFiles()
        {
            HideFiles(Application.dataPath, "*.meta");
            //HideFiles(Directory.GetParent(Application.dataPath)?.FullName, "*.csproj");
        }

        private static void HideFiles(string directory, string extension)
        {
            string[] files = Directory.GetFiles(directory, extension, SearchOption.AllDirectories);

            foreach (string filePath in files)
            {
                SetHiddenAttribute(filePath);
            }

            Debug.Log($"{extension} files have been hidden in {directory}.");
        }

        private static void SetHiddenAttribute(string filePath)
        {
            FileAttributes attributes = File.GetAttributes(filePath);

            if ((attributes & FileAttributes.Hidden) != FileAttributes.Hidden)
            {
                File.SetAttributes(filePath, attributes | FileAttributes.Hidden);
            }
        }
    }
}
#endif