Fixing Editor Path

* Again the path was hardcoded to win64

Source/Tools/Flax.Build/Utilities/Utilities.cs

@@ -6,6 +6,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Flax.Build
@@ -746,5 +747,19 @@ namespace Flax.Build
             text = text.Replace(findWhat, replaceWith);
             File.WriteAllText(file, text);
         }
+
+        /// <summary>
+        /// Returns back the exe ext for the current platform
+        /// </summary>
+        public static string GetPlatformExecutableExt()
+        {
+            var extEnding = ".exe";
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX) || RuntimeInformation.IsOSPlatform(OSPlatform.Linux)) 
+            {
+                    extEnding = "";
+            }
+
+            return extEnding;
+        }
     }
 }