[CLI] Fix Mesh export for some region formats. Close #38

AssetStudioCLI/Studio.cs

@@ -25,6 +25,7 @@ namespace AssetStudioCLI
 
         static Studio()
         {
+            Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
             Progress.Default = new Progress<int>(ShowCurProgressValue);
         }