diff --git a/LanguageIntegrator/LanguageProvider.cs b/LanguageIntegrator/LanguageProvider.cs
index 598faee1a..f4dfa8b14 100644
--- a/LanguageIntegrator/LanguageProvider.cs
+++ b/LanguageIntegrator/LanguageProvider.cs
@@ -58,7 +58,7 @@ namespace Languages.Facade
 
             foreach (ILanguage language in Languages)
                 foreach (string langExtension in language.FilesExtensions)
-                    if (langExtension == extension)
+                    if (langExtension.ToLower() == extension)
                         return language;
 
             return null;
diff --git a/StringConstants/StringConstants.cs b/StringConstants/StringConstants.cs
index 5b53c9219..afc79b293 100644
--- a/StringConstants/StringConstants.cs
+++ b/StringConstants/StringConstants.cs
@@ -216,12 +216,12 @@ namespace PascalABCCompiler
         }
 
         public static string format_procedure_name = "FormatValue";
-        public static string read_procedure_name = "read";
-        public static string write_procedure_name = "write";
-        public static string writeln_procedure_name = "writeln";
-        public static string print_procedure_name = "print";
-        public static string println_procedure_name = "println";
-        public static string readln_procedure_name = "readln";
+        public static string read_procedure_name = "Read";
+        public static string write_procedure_name = "Write";
+        public static string writeln_procedure_name = "Writeln";
+        public static string print_procedure_name = "Print";
+        public static string println_procedure_name = "Println";
+        public static string readln_procedure_name = "Readln";
         public static string text_file_name_type_name = "Text";
         public static string TextFileInitProcedureName = "TextFileInit";
         public static string StringDefaultPropertySetProcedureName = "StringDefaultPropertySet";