diff --git a/src/magic/firemind/FiremindDuelRunner.java b/src/magic/firemind/FiremindDuelRunner.java
index fe3cb6db9f..14ad5208c7 100644
--- a/src/magic/firemind/FiremindDuelRunner.java
+++ b/src/magic/firemind/FiremindDuelRunner.java
@@ -145,7 +145,7 @@ public class FiremindDuelRunner {
 
     private static String saveDeckFile(String name, String content) {
         try {
-            File deckFile = DeckUtils.getDecksFolder().resolve(name + ".dec").toFile();
+            File deckFile = DeckUtils.getDecksFolder().resolve(name + DeckUtils.DECK_EXTENSION).toFile();
             deckFile.createNewFile();
             Writer fw = Files.newBufferedWriter(deckFile.getAbsoluteFile().toPath(), UTF_8);
             BufferedWriter bw = new BufferedWriter(fw);
diff --git a/src/magic/firemind/FiremindJsonReader.java b/src/magic/firemind/FiremindJsonReader.java
index 0aac1ac1b3..9a3b7e1b9e 100644
--- a/src/magic/firemind/FiremindJsonReader.java
+++ b/src/magic/firemind/FiremindJsonReader.java
@@ -92,7 +92,7 @@ public final class FiremindJsonReader {
 
         for (MagicDeck deck : decks) {
             String validFilename = deck.getFilename().replaceAll("[^A-Za-z0-9' \\.\\-]", "_");
-            String decFilename = firemindDecksPath.resolve(validFilename + ".dec").toString();
+            String decFilename = firemindDecksPath.resolve(validFilename + DeckUtils.DECK_EXTENSION).toString();
             try {
                 DeckUtils.saveDeck(decFilename, deck);
             } catch (Exception ex) {
diff --git a/src/magic/ui/ImportWorker.java b/src/magic/ui/ImportWorker.java
index a852ef2db1..3972c0318b 100644
--- a/src/magic/ui/ImportWorker.java
+++ b/src/magic/ui/ImportWorker.java
@@ -27,6 +27,7 @@ import magic.data.GeneralConfig;
 import magic.model.MagicLogger;
 import magic.model.player.PlayerProfiles;
 import magic.translate.MText;
+import magic.utility.DeckUtils;
 import magic.utility.FileIO;
 import magic.utility.MagicFileSystem;
 
@@ -285,7 +286,7 @@ public class ImportWorker extends SwingWorker<Boolean, Void> {
         final Path sourcePath = importDataPath.resolve(directoryName);
         if (sourcePath.toFile().exists()) {
             final Path targetPath = MagicFileSystem.getDataPath().resolve(directoryName);
-            final IOFileFilter deckSuffixFilter = FileFilterUtils.suffixFileFilter(".dec");
+            final IOFileFilter deckSuffixFilter = FileFilterUtils.suffixFileFilter(DeckUtils.DECK_EXTENSION);
             FileUtils.copyDirectory(sourcePath.toFile(), targetPath.toFile(), deckSuffixFilter);
         }
         setProgressNote(OK_STRING);
diff --git a/src/magic/ui/widget/deck/DeckPicker.java b/src/magic/ui/widget/deck/DeckPicker.java
index 8ea1be81f5..d542a0eb41 100644
--- a/src/magic/ui/widget/deck/DeckPicker.java
+++ b/src/magic/ui/widget/deck/DeckPicker.java
@@ -271,11 +271,11 @@ public class DeckPicker extends JPanel {
             private Path getDeckPath(final String deckName, final DeckType deckType) {
                 switch (deckType) {
                     case Preconstructed:
-                        return DeckUtils.getPrebuiltDecksFolder().resolve(deckName + ".dec");
+                        return DeckUtils.getPrebuiltDecksFolder().resolve(deckName + DeckUtils.DECK_EXTENSION);
                     case Custom:
-                        return DeckUtils.getDecksFolder().resolve(deckName + ".dec");
+                        return DeckUtils.getDecksFolder().resolve(deckName + DeckUtils.DECK_EXTENSION);
                     case Firemind:
-                        return DeckUtils.getDecksFolder().resolve("firemind").resolve(deckName + ".dec");
+                        return DeckUtils.getDecksFolder().resolve("firemind").resolve(deckName + DeckUtils.DECK_EXTENSION);
                     default:
                         throw new RuntimeException("getDeckPath() not implemented for decktype: " + deckType);
                 }
diff --git a/src/magic/utility/DeckUtils.java b/src/magic/utility/DeckUtils.java
index 53948b03b8..493da92964 100644
--- a/src/magic/utility/DeckUtils.java
+++ b/src/magic/utility/DeckUtils.java
@@ -156,7 +156,7 @@ public class DeckUtils {
 
     public static long getDeckFileChecksum(String name, DeckType deckType) {
         Path deckPath = DeckType.getDeckFolder(deckType);
-        Path deckFile = deckPath.resolve(name + ".dec");
+        Path deckFile = deckPath.resolve(name + DECK_EXTENSION);
         return deckFile.toFile().exists() ? getDeckFileChecksum(deckFile) : -1;
     }
 
@@ -207,7 +207,7 @@ public class DeckUtils {
 
     public static MagicDeck loadDeckFromFile(String name, DeckType deckType) {
         Path deckPath = DeckType.getDeckFolder(deckType);
-        return loadDeckFromFile(deckPath.resolve(name + ".dec"));
+        return loadDeckFromFile(deckPath.resolve(name + DECK_EXTENSION));
     }
 
     public static void loadAndSetPlayerDeck(final String filename, final DuelPlayerConfig player) {
@@ -360,7 +360,7 @@ public class DeckUtils {
 
     public static Path getDeckPath(MagicDeck deck) {
         Path deckPath = DeckType.getDeckFolder(deck.getDeckType());
-        return deckPath.resolve(deck.getName() + ".dec");
+        return deckPath.resolve(deck.getName() + DECK_EXTENSION);
     }
 
     static Path getPlayerDecksFolder() {
@@ -377,7 +377,7 @@ public class DeckUtils {
      * Returns string as {@code filename}.dec
      */
     public static String getNormalizedFilename(String filename) {
-        return filename.endsWith(".dec") ? filename : filename + ".dec";
+        return filename.endsWith(DECK_EXTENSION) ? filename : filename + DECK_EXTENSION;
     }
 
     /**