replace v6 with experimental v7 code

src/MpvNet.Windows/Help/RegistryHelp.cs

@@ -0,0 +1,74 @@
+
+using Microsoft.Win32;
+
+namespace MpvNet.Windows.Help;
+
+public static class RegistryHelp
+{
+    static string? _appKey;
+
+    public static string? ProductName { get; set; }
+
+    public static string AppKey {
+        get
+        {
+            if (ProductName == null)
+                throw new Exception("ProductName cannot be null.");
+
+            return _appKey ??= @"HKCU\Software\" + ProductName;
+        }
+    }
+
+    public static void SetInt(string name, object value) => SetValue(AppKey, name, value);
+
+    public static void SetString(string name, string value) => SetValue(AppKey, name, value);
+
+    public static void SetValue(string name, object value)
+    {
+        using RegistryKey regKey = GetRootKey(AppKey).CreateSubKey(AppKey[5..], RegistryKeyPermissionCheck.ReadWriteSubTree);
+        regKey.SetValue(name, value);
+    }
+
+    public static void SetValue(string path, string name, object value)
+    {
+        using RegistryKey regKey = GetRootKey(path).CreateSubKey(path[5..], RegistryKeyPermissionCheck.ReadWriteSubTree);
+        regKey.SetValue(name, value);
+    }
+
+    public static string GetString(string name, string defaultValue = "") =>
+        GetValue(AppKey, name, defaultValue)?.ToString() ?? defaultValue;
+
+    public static int GetInt(string name, int defaultValue = 0) =>
+        GetValue(AppKey, name, defaultValue) is int i ? i : defaultValue;
+
+    public static object? GetValue(string name) => GetValue(AppKey, name, null);
+
+    public static object? GetValue(string path, string name, object? defaultValue = null)
+    {
+        using RegistryKey? regKey = GetRootKey(path).OpenSubKey(path[5..]);
+        return regKey?.GetValue(name, defaultValue);
+    }
+
+    public static void RemoveKey(string path)
+    {
+        try {
+            GetRootKey(path).DeleteSubKeyTree(path[5..], false);
+        } catch { }
+    }
+
+    public static void RemoveValue(string path, string name)
+    {
+        try {
+            using RegistryKey? regKey = GetRootKey(path).OpenSubKey(path[5..], true);
+            regKey?.DeleteValue(name, false);
+        } catch { }
+    }
+
+    static RegistryKey GetRootKey(string path) => path[..4] switch
+    {
+        "HKLM" => Registry.LocalMachine,
+        "HKCU" => Registry.CurrentUser,
+        "HKCR" => Registry.ClassesRoot,
+        _ => throw new Exception(),
+    };
+}