diff --git a/Assets/RothenburgAR/Scripts/AppInitializerBehaviour.cs b/Assets/RothenburgAR/Scripts/AppInitializerBehaviour.cs
index aa38c80..cfeb806 100644
--- a/Assets/RothenburgAR/Scripts/AppInitializerBehaviour.cs
+++ b/Assets/RothenburgAR/Scripts/AppInitializerBehaviour.cs
@@ -35,13 +35,13 @@ namespace RothenburgAR
             PoiDataManager.Instance.AddPoiPreloader(new PoiXmlPreloader());
 
             PoiDataManager.Instance.AddPoiDataSourcePath(PathHelper.ExhibitionPath);
-            PoiDataManager.Instance.AddPoiPreloader(new PoiJsonPreloader());
+            PoiDataManager.Instance.AddPoiPreloader(new PoiApiDataPreloader());
 
             PoiDataManager.Instance.LoadEverySourcePath();
 
             ExhibitionManager.Instance.AddExhibitionSourcePath(PathHelper.ExhibitionPath);
             ExhibitionManager.Instance.AddExhibitionPreloader(new ExhibitionXmlPreloader());
-            ExhibitionManager.Instance.AddExhibitionPreloader(new ExhibitionJsonPreloader());
+            ExhibitionManager.Instance.AddExhibitionPreloader(new ExhibitionApiDataPreloader());
 
             ExhibitionManager.Instance.LoadEverySourcePath(
                 (int maxPaths, int currentPaths, int subMaxExhibitions, int subCurrentExhibition) =>
diff --git a/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionJsonPreloader.cs b/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionApiDataPreloader.cs
similarity index 94%
rename from Assets/RothenburgAR/Scripts/Exhibition/ExhibitionJsonPreloader.cs
rename to Assets/RothenburgAR/Scripts/Exhibition/ExhibitionApiDataPreloader.cs
index 9a60105..d041a53 100644
--- a/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionJsonPreloader.cs
+++ b/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionApiDataPreloader.cs
@@ -10,12 +10,16 @@ using UnityEngine;
 
 namespace RothenburgAR.Exhibition
 {
-    public class ExhibitionJsonPreloader : IExhibitionPreloader
+    public class ExhibitionApiDataPreloader : IExhibitionPreloader
     {
         public bool CanLoadExhibitionDirectory(string exhibitionDirectory)
         {
             if (!Directory.Exists(exhibitionDirectory))
                 return false;
+            if (!File.Exists(Path.Combine(exhibitionDirectory, "tracker.xml")))
+                return false;
+            if (!File.Exists(Path.Combine(exhibitionDirectory, "tracker.dat")))
+                return false;
 
             var languageDirs = new DirectoryInfo(exhibitionDirectory).GetDirectories().Select(d => d.Name).ToList();
             foreach (var dir in languageDirs)
@@ -25,7 +29,6 @@ namespace RothenburgAR.Exhibition
             }
 
             // Todo: More validations
-
             return true;
         }
 
diff --git a/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionJsonPreloader.cs.meta b/Assets/RothenburgAR/Scripts/Exhibition/ExhibitionApiDataPreloader.cs.meta
similarity index 100%
rename from Assets/RothenburgAR/Scripts/Exhibition/ExhibitionJsonPreloader.cs.meta
rename to Assets/RothenburgAR/Scripts/Exhibition/ExhibitionApiDataPreloader.cs.meta
diff --git a/Assets/RothenburgAR/Scripts/PointOfInterest/PoiJsonPreloader.cs b/Assets/RothenburgAR/Scripts/PointOfInterest/PoiApiDataPreloader.cs
similarity index 98%
rename from Assets/RothenburgAR/Scripts/PointOfInterest/PoiJsonPreloader.cs
rename to Assets/RothenburgAR/Scripts/PointOfInterest/PoiApiDataPreloader.cs
index fb4c392..fa6e4af 100644
--- a/Assets/RothenburgAR/Scripts/PointOfInterest/PoiJsonPreloader.cs
+++ b/Assets/RothenburgAR/Scripts/PointOfInterest/PoiApiDataPreloader.cs
@@ -10,7 +10,7 @@ using UnityEngine;
 
 namespace RothenburgAR.PointOfInterest
 {
-    public class PoiJsonPreloader : IPoiPreloader
+    public class PoiApiDataPreloader : IPoiPreloader
     {
         public bool CanLoadPoiDirectory(string poiDirectory)
         {
@@ -25,7 +25,6 @@ namespace RothenburgAR.PointOfInterest
             }
 
             // Todo: More validations
-
             return true;
         }
 
diff --git a/Assets/RothenburgAR/Scripts/PointOfInterest/PoiJsonPreloader.cs.meta b/Assets/RothenburgAR/Scripts/PointOfInterest/PoiApiDataPreloader.cs.meta
similarity index 100%
rename from Assets/RothenburgAR/Scripts/PointOfInterest/PoiJsonPreloader.cs.meta
rename to Assets/RothenburgAR/Scripts/PointOfInterest/PoiApiDataPreloader.cs.meta