Fix URL opener not working on Windows build.

Assets/Cryville/Common/Unity/UrlOpener.cs

@@ -1,8 +1,22 @@
+using System;
+using System.Runtime.InteropServices;
+
 namespace Cryville.Common.Unity {
 	public static class UrlOpener {
 		public static void Open(string url) {
 #if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
-			System.Diagnostics.Process.Start(url);
+			url += "\0";
+			unsafe {
+				fixed (char* lpFile = url) {
+					var info = new SHELLEXECUTEINFOW {
+						cbSize = (uint)sizeof(SHELLEXECUTEINFOW),
+						fMask = 0x0540,
+						lpFile = lpFile,
+						nShow = 1,
+					};
+					ShellExecuteExW(ref info);
+				}
+			}
 #elif UNITY_ANDROID
 			using (var clazz = new UnityEngine.AndroidJavaClass("world.cryville.common.unity.UrlOpener")) {
 				clazz.CallStatic("open", url);
@@ -22,5 +36,27 @@ namespace Cryville.Common.Unity {
 #error Unknown platform.
 #endif
 		}
+
+#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
+		[DllImport("shell32.dll")]
+		static extern void ShellExecuteExW(ref SHELLEXECUTEINFOW pExecInfo);
+		unsafe struct SHELLEXECUTEINFOW {
+			public uint cbSize;
+			public uint fMask;
+			public IntPtr hwnd;
+			public char* lpVerb;
+			public char* lpFile;
+			public char* lpParameters;
+			public char* lpDirectory;
+			public int nShow;
+			public IntPtr hInstApp;
+			public IntPtr lpIDList;
+			public IntPtr lpClass;
+			public IntPtr hkeyClass;
+			public uint dwHotKey;
+			public IntPtr hIconMonitor;
+			public IntPtr hProcess;
+		}
+#endif
 	}
 }