Fix the not loading OpenAL32.dll issue

Author: pzgulyas

Source/Contrib/TrackViewer/Program.cs

@@ -1,4 +1,4 @@
-// COPYRIGHT 2014, 2018 by the Open Rails project.
+// COPYRIGHT 2014, 2018 by the Open Rails project.
 // 
 // This file is part of Open Rails.
 // 
@@ -15,10 +15,11 @@
 // You should have received a copy of the GNU General Public License
 // along with Open Rails.  If not, see <http://www.gnu.org/licenses/>.
 using System;
+using System.IO;
 using System.Diagnostics;
+using System.Reflection;
 using System.Windows.Forms;
 
-
 namespace ORTS.TrackViewer
 {
     static class Program
@@ -31,6 +32,11 @@ static void Main(string[] args)
         {
             using (TrackViewer trackViewer = new TrackViewer(args))
             {
+                //enables loading of dll for specific architecture(32 or 64bit) from distinct folders, useful when both versions require same name (as for OpenAL32.dll)
+                string path = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "Native");
+                path = Path.Combine(path, (Environment.Is64BitProcess) ? "X64" : "X86");
+                Orts.NativeMethods.SetDllDirectory(path);
+
                 // code below is modified version from what is found in GameStateRunActivity.cs
                 if (Debugger.IsAttached) // Separate code path during debugging, so IDE stops at the problem and not at the message.
                 {

Source/RunActivity/Program.cs

@@ -30,10 +30,10 @@
 
 namespace Orts
 {
-    static class NativeMethods
+    public static class NativeMethods
     {
         [DllImport("kernel32.dll", CallingConvention = CallingConvention.StdCall)]
-        internal static extern bool SetDllDirectory(string pathName);
+        public static extern bool SetDllDirectory(string pathName);
     }
 
     static class Program