diff --git a/src/main/java/konogonka/Controllers/MainController.java b/src/main/java/konogonka/Controllers/MainController.java
index 814082d..472edd9 100644
--- a/src/main/java/konogonka/Controllers/MainController.java
+++ b/src/main/java/konogonka/Controllers/MainController.java
@@ -86,7 +86,7 @@ public class MainController implements Initializable {
         else
             fileChooser.setInitialDirectory(new File(System.getProperty("user.home")));
 
-        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("NS files", "*.nsp", "*.xci", "*.nca", "*.tik", "*.xml", "*.npdm"));
+        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("NS files", "*.nsp", "*.nsz", "*.xci", "*.nca", "*.tik", "*.xml", "*.npdm"));
 
         this.selectedFile = fileChooser.showOpenDialog(analyzeBtn.getScene().getWindow());
         // todo: fix
@@ -102,18 +102,28 @@ public class MainController implements Initializable {
             filenameSelected.setText(this.selectedFile.getAbsolutePath());
             previouslyOpenedPath = this.selectedFile.getParent();
             analyzeBtn.setDisable(false);
-            if (this.selectedFile.getName().toLowerCase().endsWith(".nsp"))
-                tabPane.getSelectionModel().select(0);
-            else if (this.selectedFile.getName().toLowerCase().endsWith(".xci"))
-                tabPane.getSelectionModel().select(1);
-            else if (this.selectedFile.getName().toLowerCase().endsWith(".nca"))
-                tabPane.getSelectionModel().select(2);
-            else if (this.selectedFile.getName().toLowerCase().endsWith(".tik"))
-                tabPane.getSelectionModel().select(3);
-            else if (this.selectedFile.getName().toLowerCase().endsWith(".xml"))
-                tabPane.getSelectionModel().select(4);
-            else if (this.selectedFile.getName().toLowerCase().endsWith(".npdm"))
-                tabPane.getSelectionModel().select(5);
+            String fileExtension = this.selectedFile.getName().toLowerCase().replaceAll("^.*\\.", "");
+            switch (fileExtension){
+                case "nsp":
+                case "nsz":
+                    tabPane.getSelectionModel().select(0);
+                    break;
+                case "xci":
+                    tabPane.getSelectionModel().select(1);
+                    break;
+                case "nca":
+                    tabPane.getSelectionModel().select(2);
+                    break;
+                case "tic":
+                    tabPane.getSelectionModel().select(3);
+                    break;
+                case "xml":
+                    tabPane.getSelectionModel().select(4);
+                    break;
+                case "npdm":
+                    tabPane.getSelectionModel().select(5);
+                    break;
+            }
         }
 
         logArea.clear();
@@ -122,18 +132,28 @@ public class MainController implements Initializable {
      * Start analyze
      * */
     private void analyzeFile(){
-        if (selectedFile.getName().toLowerCase().endsWith("nsp"))
-            NSPTabController.analyze(selectedFile);      // TODO: NSP OR XCI
-        else if (selectedFile.getName().toLowerCase().endsWith("xci"))
-            XCITabController.analyze(selectedFile);
-        else if (selectedFile.getName().toLowerCase().endsWith("nca"))
-            NCATabController.analyze(selectedFile);
-        else if (selectedFile.getName().toLowerCase().endsWith("tik"))
-            TIKTabController.analyze(selectedFile);
-        else if (selectedFile.getName().toLowerCase().endsWith("xml"))
-            XMLTabController.analyze(selectedFile);
-        else if (selectedFile.getName().toLowerCase().endsWith("npdm"))
-            NPDMTabController.analyze(selectedFile);
+        final String fileExtension = selectedFile.getName().toLowerCase().replaceAll("^.*\\.", "");
+        switch (fileExtension){
+            case "nsp":
+            case "nsz":
+                NSPTabController.analyze(selectedFile);      // TODO: NSP OR XCI
+                break;
+            case "xci":
+                XCITabController.analyze(selectedFile);
+                break;
+            case "nca":
+                NCATabController.analyze(selectedFile);
+                break;
+            case "tic":
+                TIKTabController.analyze(selectedFile);
+                break;
+            case "xml":
+                XMLTabController.analyze(selectedFile);
+                break;
+            case "npdm":
+                NPDMTabController.analyze(selectedFile);
+                break;
+        }
     }
     @FXML
     private void showHideLogs(){
diff --git a/src/main/java/konogonka/Tools/NCA/NCAProvider.java b/src/main/java/konogonka/Tools/NCA/NCAProvider.java
index 4962972..57b61f4 100644
--- a/src/main/java/konogonka/Tools/NCA/NCAProvider.java
+++ b/src/main/java/konogonka/Tools/NCA/NCAProvider.java
@@ -193,8 +193,27 @@ public class NCAProvider {
                 decryptedKey2 = cipher.doFinal(encryptedKey2);
                 decryptedKey3 = cipher.doFinal(encryptedKey3);
             }
-            else
-                throw new Exception("key_are_key_[UNKNOWN] requested ("+keyIndex+"). Not supported.");
+            else{
+                StringBuilder exceptionStringBuilder = new StringBuilder("key_area_key_");
+                switch (keyIndex){
+                    case 0:
+                        exceptionStringBuilder.append("application_");
+                        break;
+                    case 1:
+                        exceptionStringBuilder.append("ocean_");
+                        break;
+                    case 2:
+                        exceptionStringBuilder.append("system_");
+                        break;
+                    default:
+                        exceptionStringBuilder.append(keyIndex);
+                        exceptionStringBuilder.append("[UNKNOWN]_");
+                }
+                exceptionStringBuilder.append(String.format("%02d", cryptoTypeReal));
+                exceptionStringBuilder.append(" requested. Not supported or not found.");
+
+                throw new Exception(exceptionStringBuilder.toString());
+            }
         }
 
         tableEntry0 = new NCAHeaderTableEntry(tableBytes);
diff --git a/src/main/resources/locale.properties b/src/main/resources/locale.properties
index d960fa7..9af4883 100644
--- a/src/main/resources/locale.properties
+++ b/src/main/resources/locale.properties
@@ -1,4 +1,4 @@
-btnFileOpen=Select NSP/XCI/NCA/TIK/XML
+btnFileOpen=Select
 btnAnalyze=Analyze
 lblNoFileSelected=No files selected.
 tableNumberLbl=#
diff --git a/src/main/resources/locale_fra.properties b/src/main/resources/locale_fra.properties
index b27721a..bf8e0f4 100644
--- a/src/main/resources/locale_fra.properties
+++ b/src/main/resources/locale_fra.properties
@@ -1,4 +1,4 @@
-btnFileOpen=Selectionner NSP/XCI/NCA/TIK/XML
+btnFileOpen=Selectionner
 btnAnalyze=Analyser
 lblNoFileSelected=Aucuns fichiers s\u00E9lectionn\u00E9s.
 tableUploadLbl=Extraire ?
diff --git a/src/main/resources/locale_rus.properties b/src/main/resources/locale_rus.properties
index 91f8646..aded4df 100644
--- a/src/main/resources/locale_rus.properties
+++ b/src/main/resources/locale_rus.properties
@@ -1,4 +1,4 @@
-btnFileOpen=\u0412\u044B\u0431\u0440\u0430\u0442\u044C NSP/XCI/NCA/TIK/XML
+btnFileOpen=\u0412\u044B\u0431\u0440\u0430\u0442\u044C
 btnAnalyze=\u0410\u043D\u0430\u043B\u0438\u0437\u0438\u0440\u043E\u0432\u0430\u0442\u044C
 lblNoFileSelected=\u0424\u0430\u0439\u043B\u044B \u043D\u0435 \u0432\u044B\u0431\u0440\u0430\u043D\u044B.
 tableUploadLbl=\u0420\u0430\u0441\u043F\u0430\u043A\u043E\u0432\u0430\u0442\u044C?
diff --git a/src/main/resources/locale_ukr.properties b/src/main/resources/locale_ukr.properties
index ef5f099..1a8f80a 100644
--- a/src/main/resources/locale_ukr.properties
+++ b/src/main/resources/locale_ukr.properties
@@ -1,4 +1,4 @@
-btnFileOpen=\u0412\u0438\u0431\u0440\u0430\u0442\u0438 NSP/XCI/NCA/TIK/XML
+btnFileOpen=\u0412\u0438\u0431\u0440\u0430\u0442\u0438
 btnAnalyze=\u0410\u043D\u0430\u043B\u0456\u0437\u0443\u0432\u0430\u0442\u0438
 lblNoFileSelected=\u0424\u0430\u0439\u043B\u0438 \u043D\u0435 \u0432\u0438\u0431\u0440\u0430\u043D\u0456.
 tableNumberLbl=\u2116