diff --git a/apps/opencs/model/world/resources.cpp b/apps/opencs/model/world/resources.cpp
index c819283e18..357661ac39 100644
--- a/apps/opencs/model/world/resources.cpp
+++ b/apps/opencs/model/world/resources.cpp
@@ -8,7 +8,8 @@
 
 #include <components/misc/stringops.hpp>
 
-CSMWorld::Resources::Resources (const std::string& baseDirectory)
+CSMWorld::Resources::Resources (const std::string& baseDirectory,
+    const char * const *extensions)
 : mBaseDirectory (baseDirectory)
 {
     int baseSize = mBaseDirectory.size();
@@ -28,14 +29,33 @@ CSMWorld::Resources::Resources (const std::string& baseDirectory)
         for (Ogre::StringVector::const_iterator iter (resources->begin());
             iter!=resources->end(); ++iter)
         {
-            if (static_cast<int> (iter->size())>=baseSize+1 &&
-                iter->substr (0, baseSize)==mBaseDirectory &&
-                ((*iter)[baseSize]=='/' || (*iter)[baseSize]=='\\'))
+            if (static_cast<int> (iter->size())<baseSize+1 ||
+                iter->substr (0, baseSize)!=mBaseDirectory ||
+                ((*iter)[baseSize]!='/' && (*iter)[baseSize]!='\\'))
+                continue;
+
+            if (extensions)
             {
-                std::string file = iter->substr (baseSize+1);
-                mFiles.push_back (file);
-                mIndex.insert (std::make_pair (file, static_cast<int> (mFiles.size())-1));
+                std::string::size_type index = iter->find_last_of ('.');
+
+                if (index==std::string::npos)
+                    continue;
+
+                std::string extension = iter->substr (index+1);
+
+                int i = 0;
+
+                for (; extensions[i]; ++i)
+                    if (extensions[i]==extension)
+                        break;
+
+                if (!extensions[i])
+                    continue;
             }
+
+            std::string file = iter->substr (baseSize+1);
+            mFiles.push_back (file);
+            mIndex.insert (std::make_pair (file, static_cast<int> (mFiles.size())-1));
         }
     }
 }
diff --git a/apps/opencs/model/world/resources.hpp b/apps/opencs/model/world/resources.hpp
index 54c4fa8214..599f9a35b4 100644
--- a/apps/opencs/model/world/resources.hpp
+++ b/apps/opencs/model/world/resources.hpp
@@ -15,7 +15,7 @@ namespace CSMWorld
 
         public:
 
-            Resources (const std::string& baseDirectory);
+            Resources (const std::string& baseDirectory, const char * const *extensions = 0);
 
             int getSize() const;
 
diff --git a/apps/opencs/model/world/resourcesmanager.cpp b/apps/opencs/model/world/resourcesmanager.cpp
index 980e099f4b..7c782e7c59 100644
--- a/apps/opencs/model/world/resourcesmanager.cpp
+++ b/apps/opencs/model/world/resourcesmanager.cpp
@@ -5,7 +5,10 @@
 
 void CSMWorld::ResourcesManager::listResources()
 {
-    mResources.insert (std::make_pair (UniversalId::Type_Mesh, "meshes"));
+    static const char * const sMeshTypes[] = { "nif", 0 };
+
+    mResources.insert (
+        std::make_pair (UniversalId::Type_Mesh, Resources ("meshes", sMeshTypes)));
     mResources.insert (std::make_pair (UniversalId::Type_Icon, "icons"));
     mResources.insert (std::make_pair (UniversalId::Type_Music, "music"));
     mResources.insert (std::make_pair (UniversalId::Type_SoundRes, "sound"));