diff --git a/apps/openmw/engine.cpp b/apps/openmw/engine.cpp
index bbc68b8e2..31c947054 100644
--- a/apps/openmw/engine.cpp
+++ b/apps/openmw/engine.cpp
@@ -200,12 +200,12 @@ void OMW::Engine::loadBSA()
 
     for (Files::MultiDirCollection::TIter iter (bsa.begin()); iter!=bsa.end(); ++iter)
     {
-         std::cout << "Adding " << iter->second.string() << std::endl;
-         Bsa::addBSA (iter->second.string());
+        std::cout << "Adding " << iter->second.string() << std::endl;
+        Bsa::addBSA (iter->second.string());
     }
 
-    std::cout << "Data dir " << mDataDir.string() << std::endl;
-    Bsa::addDir(mDataDir.string(), mFSStrict);
+    //std::cout << "Data dir " << mDataDir.string() << std::endl;
+    //Bsa::addDir(mDataDir.string(), mFSStrict);
 }
 
 // add resources directory
@@ -228,7 +228,7 @@ void OMW::Engine::setDataDirs (const Files::PathContainer& dataDirs)
 {
     /// \todo remove mDataDir, once resources system can handle multiple directories
     assert (!dataDirs.empty());
-    mDataDir = dataDirs.back();
+    mDataDirs = dataDirs;
     mFileCollections = Files::Collections (dataDirs, !mFSStrict);
 }
 
@@ -339,7 +339,7 @@ void OMW::Engine::go()
     mEnvironment.mSoundManager = new MWSound::SoundManager(mOgre->getRoot(),
                                                            mOgre->getCamera(),
                                                            mEnvironment.mWorld->getStore(),
-                                                           (mDataDir),
+                                                           mDataDirs,
                                                            mUseSound, mFSStrict, mEnvironment);
 
     // Create script system
diff --git a/apps/openmw/engine.hpp b/apps/openmw/engine.hpp
index 97079f5a5..40bf73c6d 100644
--- a/apps/openmw/engine.hpp
+++ b/apps/openmw/engine.hpp
@@ -64,7 +64,7 @@ namespace OMW
     class Engine : private Ogre::FrameListener
     {
             std::string mEncoding;
-            boost::filesystem::path mDataDir;
+            Files::PathContainer mDataDirs;
             boost::filesystem::path mResDir;
             OEngine::Render::OgreRenderer *mOgre;
             OEngine::Physic::PhysicEngine* mPhysicEngine;
diff --git a/apps/openmw/mwsound/soundmanager.cpp b/apps/openmw/mwsound/soundmanager.cpp
index 7390e4c5c..76ef23bc2 100644
--- a/apps/openmw/mwsound/soundmanager.cpp
+++ b/apps/openmw/mwsound/soundmanager.cpp
@@ -4,8 +4,6 @@
 #include <algorithm>
 #include <map>
 
-using namespace std;
-
 #include <OgreRoot.h>
 
 #include <openengine/sound/sndmanager.hpp>
@@ -15,6 +13,7 @@ using namespace std;
 #include <components/file_finder/file_finder.hpp>
 #include <components/esm_store/store.hpp>
 
+
 #include "../mwworld/environment.hpp"
 #include "../mwworld/world.hpp"
 #include "../mwworld/player.hpp"
@@ -90,24 +89,28 @@ namespace MWSound
     // relative to the sound dir, and translates them into full paths
     // of existing files in the filesystem, if they exist.
     bool FSstrict;
-    FileFinder::FileFinder files;
-    FileFinder::FileFinderStrict strict;
-    FileFinder::FileFinder musicpath;
-    FileFinder::FileFinderStrict musicpathStrict;
-
-    SoundImpl(Ogre::Root *root, Ogre::Camera *camera,
-              const ESMS::ESMStore &str,
-              const std::string &soundDir, const std::string &musicDir, bool fsstrict)
+    FileFinder::LessTreeFileFinder files;
+    FileFinder::StrictTreeFileFinder strict;
+    FileFinder::LessTreeFileFinder musicpath;
+    FileFinder::StrictTreeFileFinder musicpathStrict;
+
+    SoundImpl(Ogre::Root *root, Ogre::Camera *camera, const ESMS::ESMStore &str,
+        const Files::PathContainer& soundDir,
+        const Files::PathContainer& musicDir,
+        bool fsstrict)
       : mgr(new OEManager(SoundFactoryPtr(new SOUND_FACTORY)))
       , updater(mgr)
       , cameraTracker(mgr)
       , store(str)
-      , files(soundDir), strict(soundDir)
-      ,musicpath(musicDir), musicpathStrict(musicDir)
+      , FSstrict(fsstrict)
+      , files(soundDir)
+      , strict(soundDir)
+      , musicpath(musicDir)
+      , musicpathStrict(musicDir)
     {
-      FSstrict = fsstrict;
-      cout << "Sound output:  " << SOUND_OUT << endl;
-      cout << "Sound decoder: " << SOUND_IN << endl;
+
+      std::cout << "Sound output:  " << SOUND_OUT << std::endl;
+      std::cout << "Sound decoder: " << SOUND_IN << std::endl;
       // Attach the camera to the camera tracker
       cameraTracker.followCamera(camera);
 
@@ -136,36 +139,49 @@ namespace MWSound
 
     bool hasFile(const std::string &str, bool music = false)
     {
-        if(FSstrict == false)
+        bool found = false;
+        if(!FSstrict)
         {
             if(music)
             {
-                if(musicpath.has(str)) return true;
-
+                found = musicpath.has(str);
                 // Not found? Try with .mp3
-                return musicpath.has(toMp3(str));
+                if (!found)
+                {
+                    found = musicpath.has(toMp3(str));
+                }
             }
             else
             {
-                if(files.has(str)) return true;
-                return files.has(toMp3(str));
+                found = files.has(str);
+                if (!found)
+                {
+                    found = files.has(toMp3(str));
+                }
             }
         }
         else
         {
             if(music)
             {
-                if(musicpathStrict.has(str)) return true;
-
+                found = musicpathStrict.has(str);
                 // Not found? Try with .mp3
-                return musicpathStrict.has(toMp3(str));
+                if (!found)
+                {
+                    found = musicpathStrict.has(toMp3(str));
+                }
             }
             else
             {
-                if(strict.has(str)) return true;
-                    return strict.has(toMp3(str));
+                found = strict.has(str);
+                if (!found)
+                {
+                    found = strict.has(toMp3(str));
+                }
             }
         }
+
+        return found;
     }
 
     // Convert a Morrowind sound path (eg. Fx\funny.wav) to full path
@@ -258,13 +274,13 @@ namespace MWSound
         }
       catch(...)
         {
-          cout << "Error loading " << file << ", skipping.\n";
+          std::cout << "Error loading " << file << ", skipping.\n";
         }
     }
 
     // Clears all the sub-elements of a given iterator, and then
     // removes it from 'sounds'.
-    void clearAll(PtrMap::iterator it)
+    void clearAll(PtrMap::iterator& it)
     {
       IDMap::iterator sit = it->second.begin();
 
@@ -362,9 +378,9 @@ namespace MWSound
             }
         }
     }
-  };
+  }; /* SoundImpl */
 
-  void SoundManager::streamMusicFull (const std::string& filename)
+  void SoundManager::streamMusicFull(const std::string& filename)
   {
     if(!mData) return;
 
@@ -381,20 +397,24 @@ namespace MWSound
   }
 
   SoundManager::SoundManager(Ogre::Root *root, Ogre::Camera *camera,
-                             const ESMS::ESMStore &store,
-                             boost::filesystem::path dataDir,
-                             bool useSound, bool fsstrict, MWWorld::Environment& environment)
-    : mData(NULL), fsStrict (fsstrict), mEnvironment (environment)
+    const ESMS::ESMStore &store, const Files::PathContainer& dataDirs,
+    bool useSound, bool fsstrict, MWWorld::Environment& environment)
+    : mData(NULL)
+    , fsStrict(fsstrict)
+    , mEnvironment(environment)
   {
-    MP3Lookup(dataDir / "Music/Explore/");
-    if(useSound)
-      mData = new SoundImpl(root, camera, store, (dataDir / "Sound").string(), (dataDir / "Music").string(), fsstrict);
+    for (Files::PathContainer::const_iterator it = dataDirs.begin(); it != dataDirs.end(); ++it)
+    {
+        MP3Lookup((*it) / "Music/Explore/");
+    }
 
+    if(useSound)
+    {
+      mData = new SoundImpl(root, camera, store, dataDirs /* Sound */, dataDirs /* Music */, fsstrict);
+    }
 
     test.name = "";
     total = 0;
-
-
   }
 
   SoundManager::~SoundManager()
@@ -407,14 +427,12 @@ namespace MWSound
     {
         if(mData->hasFile(filename, true))
         {
-            std::string fullpath = mData->convertPath(filename, true);
-            streamMusicFull(fullpath);
+            streamMusicFull(mData->convertPath(filename, true));
         }
     }
 
-
-  void SoundManager::MP3Lookup(boost::filesystem::path dir)
-{
+  void SoundManager::MP3Lookup(const boost::filesystem::path& dir)
+  {
     boost::filesystem::directory_iterator dir_iter(dir), dir_end;
 
     std::string mp3extension = ".mp3";
@@ -425,35 +443,30 @@ namespace MWSound
             files.push_back(*dir_iter);
         }
     }
-}
+  }
 
   void SoundManager::startRandomTitle()
-{
-    std::vector<boost::filesystem::path>::iterator fileIter;
-
-    if(files.size() > 0)
+  {
+    if(!files.empty())
     {
-        fileIter = files.begin();
-        srand ( time(NULL) );
+        Files::PathContainer::iterator fileIter = files.begin();
+        srand( time(NULL) );
         int r = rand() % files.size() + 1;        //old random code
 
-        for(int i = 1; i < r; i++)
-        {
-            fileIter++;
-        }
+        std::advance(fileIter, r - 1);
         std::string music = fileIter->string();
+        std::cout << "Playing " << music << "\n";
+
         try
         {
-            std::cout << "Playing " << music << "\n";
             streamMusicFull(music);
         }
-        catch(std::exception &e)
+        catch (std::exception &e)
         {
             std::cout << "  Music Error: " << e.what() << "\n";
         }
     }
-}
-
+  }
 
     bool SoundManager::isMusicPlaying()
     {
@@ -465,14 +478,12 @@ namespace MWSound
         return test;
     }
 
-   SoundManager::SoundImpl SoundManager::getMData()
+  SoundManager::SoundImpl SoundManager::getMData()
   {
      // bool test = mData->music->isPlaying();
       return *mData;
   }
 
-
-
   void SoundManager::say (MWWorld::Ptr ptr, const std::string& filename)
   {
     // The range values are not tested
@@ -480,7 +491,7 @@ namespace MWSound
     if(mData->hasFile(filename))
       mData->add(mData->convertPath(filename), ptr, "_say_sound", 1, 1, 100, 20000, false);
     else
-      cout << "Sound file " << filename << " not found, skipping.\n";
+      std::cout << "Sound file " << filename << " not found, skipping.\n";
   }
 
   bool SoundManager::sayDone (MWWorld::Ptr ptr) const
@@ -490,20 +501,20 @@ namespace MWSound
   }
 
 
-  void SoundManager::playSound (const std::string& soundId, float volume, float pitch)
+  void SoundManager::playSound(const std::string& soundId, float volume, float pitch)
   {
     if(!mData) return;
     // Play and forget
     float min, max;
     const std::string &file = mData->lookup(soundId, volume, min, max);
-    if(file != "")
-      {
+    if (file != "")
+    {
         SoundPtr snd = mData->mgr->load(file);
         snd->setVolume(volume);
         snd->setRange(min,max);
         snd->setPitch(pitch);
         snd->play();
-      }
+    }
   }
 
   void SoundManager::playSound3D (MWWorld::Ptr ptr, const std::string& soundId,
@@ -514,7 +525,7 @@ namespace MWSound
     // Look up the sound in the ESM data
     float min, max;
     const std::string &file = mData->lookup(soundId, volume, min, max);
-    if(file != "")
+    if (file != "")
       mData->add(file, ptr, soundId, volume, pitch, min, max, loop);
   }
 
@@ -541,18 +552,19 @@ namespace MWSound
 
   void SoundManager::updateObject(MWWorld::Ptr ptr)
   {
-    if(!mData) return;
-    mData->updatePositions(ptr);
+    if (mData != NULL)
+    {
+        mData->updatePositions(ptr);
+    }
   }
 
   void SoundManager::update (float duration)
   {
-        std::string effect;
-
         MWWorld::Ptr::CellStore *current = mEnvironment.mWorld->getPlayer().getPlayer().getCell();
 
         //If the region has changed
-        if(!(current->cell->data.flags & current->cell->Interior) && timer.elapsed() >= 10){
+        if(!(current->cell->data.flags & current->cell->Interior) && timer.elapsed() >= 10)
+        {
             timer.restart();
             if (test.name != current->cell->region)
             {
@@ -564,11 +576,12 @@ namespace MWSound
             {
                 std::vector<ESM::Region::SoundRef>::iterator soundIter = test.soundList.begin();
                 //mEnvironment.mSoundManager
-                if(total == 0){
-                    while (!(soundIter == test.soundList.end()))
+                if(total == 0)
+                {
+                    while (soundIter != test.soundList.end())
                     {
-                        ESM::NAME32 go = soundIter->sound;
                         int chance = (int) soundIter->chance;
+                        //ESM::NAME32 go = soundIter->sound;
                         //std::cout << "Sound: " << go.name <<" Chance:" <<  chance << "\n";
                         soundIter++;
                         total += chance;
@@ -578,7 +591,7 @@ namespace MWSound
                 int r = rand() % total;        //old random code
                 int pos = 0;
                 soundIter = test.soundList.begin();
-                while (!(soundIter == test.soundList.end()))
+                while (soundIter != test.soundList.end())
                 {
                     const ESM::NAME32 go = soundIter->sound;
                     int chance = (int) soundIter->chance;
@@ -586,13 +599,11 @@ namespace MWSound
                     soundIter++;
                     if( r - pos < chance)
                     {
-                        effect = go.name;
                         //play sound
                         std::cout << "Sound: " << go.name <<" Chance:" <<  chance << "\n";
-                        mEnvironment.mSoundManager->playSound(effect, 20.0, 1.0);
+                        mEnvironment.mSoundManager->playSound(go.name, 20.0, 1.0);
 
                         break;
-
                     }
                     pos += chance;
                 }
diff --git a/apps/openmw/mwsound/soundmanager.hpp b/apps/openmw/mwsound/soundmanager.hpp
index 7dff16c76..5c3f473f2 100644
--- a/apps/openmw/mwsound/soundmanager.hpp
+++ b/apps/openmw/mwsound/soundmanager.hpp
@@ -2,14 +2,15 @@
 #define GAME_SOUND_SOUNDMANAGER_H
 
 #include <string>
-#include <map>
 
 #include <boost/filesystem.hpp>
+#include <boost/timer.hpp>
+
 #include "../mwworld/ptr.hpp"
 #include <openengine/sound/sndmanager.hpp>
+#include <components/files/multidircollection.hpp>
 
 
-#include <boost/timer.hpp>
 
 namespace Ogre
 {
@@ -37,7 +38,7 @@ namespace MWSound
             struct SoundImpl;
 
             SoundImpl *mData;
-            std::vector<boost::filesystem::path> files;
+            Files::PathContainer files;
             bool fsStrict;
             MWWorld::Environment& mEnvironment;
 
@@ -52,7 +53,7 @@ namespace MWSound
         public:
 
             SoundManager(Ogre::Root*, Ogre::Camera*, const ESMS::ESMStore &store,
-                   boost::filesystem::path dataDir, bool useSound, bool fsstrict,
+                   const Files::PathContainer& dataDir, bool useSound, bool fsstrict,
                    MWWorld::Environment& environment);
             ~SoundManager();
 
@@ -61,7 +62,7 @@ namespace MWSound
             /// \param filename name of a sound file in "Music/" in the data directory.
 
             void startRandomTitle();
-            void MP3Lookup(boost::filesystem::path dir);
+            void MP3Lookup(const boost::filesystem::path& dir);
 
             bool isMusicPlaying();
 
diff --git a/components/file_finder/file_finder.hpp b/components/file_finder/file_finder.hpp
index 0e1e07226..8a15af73a 100644
--- a/components/file_finder/file_finder.hpp
+++ b/components/file_finder/file_finder.hpp
@@ -1,9 +1,11 @@
 #ifndef FILE_FINDER_MAIN_H
 #define FILE_FINDER_MAIN_H
 
+#include <map>
+
 #include "search.hpp"
 #include "filename_less.hpp"
-#include <map>
+#include <components/files/multidircollection.hpp>
 
 namespace FileFinder
 {
@@ -11,7 +13,8 @@ namespace FileFinder
 template <typename LESS>
 class FileFinderT
 {
-  std::map<std::string, std::string, LESS> table;
+  typedef std::map<std::string, std::string, LESS> TableContainer;
+  TableContainer table;
 
   struct Inserter : ReturnPath
   {
@@ -35,12 +38,12 @@ public:
 
     // Remember the original path length, so we can cut it away from
     // the relative paths used as keys
-    std::string pstring = path.string();
+    const std::string& pstring = path.string();
     inserter.cut = pstring.size();
 
     // If the path does not end in a slash, then boost will add one
     // later, which means one more character we have to remove.
-    char last = pstring[pstring.size()-1];
+    char last = *pstring.rbegin();
     if(last != '\\' && last != '/')
       inserter.cut++;
 
@@ -56,12 +59,84 @@ public:
   // Find the full path from a relative path.
   const std::string &lookup(const std::string& file) const
   {
-        return table.find(file)->second;
+    static std::string empty;
+    typename TableContainer::const_iterator it = table.find(file);
+    return (it != table.end()) ? it->second : empty;
   }
 };
 
+template
+<
+    class LESS
+>
+struct TreeFileFinder
+{
+    typedef TreeFileFinder<LESS> finder_t;
+
+    TreeFileFinder(const Files::PathContainer& paths, bool recurse = true)
+    {
+        struct : ReturnPath
+        {
+            finder_t *owner;
+            int cut;
+
+            void add(const boost::filesystem::path &pth)
+            {
+                std::string file = pth.string();
+                std::string key = file.substr(cut);
+                owner->mTable[key] = file;
+            }
+        } inserter;
+
+        inserter.owner = this;
+
+        for (Files::PathContainer::const_iterator it = paths.begin(); it != paths.end(); ++it)
+        {
+
+            // Remember the original path length, so we can cut it away from
+            // the relative paths used as keys
+            const std::string& pstring = it->string();
+            inserter.cut = pstring.size();
+
+            // If the path does not end in a slash, then boost will add one
+            // later, which means one more character we have to remove.
+            char last = *pstring.rbegin();
+            if (last != '\\' && last != '/')
+            {
+              inserter.cut++;
+            }
+
+            // Fill the map
+            find(*it, inserter, recurse);
+        }
+    }
+
+    bool has(const std::string& file) const
+    {
+        return mTable.find(file) != mTable.end();
+    }
+
+    const std::string& lookup(const std::string& file) const
+    {
+        static std::string empty;
+        typename TableContainer::const_iterator it = mTable.find(file);
+        return (it != mTable.end()) ? it->second : empty;
+    }
+
+    private:
+        typedef std::map<std::string, std::string, LESS> TableContainer;
+        TableContainer mTable;
+
+//        Inserter inserter;
+};
+
+
 // The default is to use path_less for equality checks
 typedef FileFinderT<path_less> FileFinder;
 typedef FileFinderT<path_slash> FileFinderStrict;
-}
-#endif
+
+typedef TreeFileFinder<path_less> LessTreeFileFinder;
+typedef TreeFileFinder<path_slash> StrictTreeFileFinder;
+
+} /* namespace FileFinder */
+#endif /* FILE_FINDER_MAIN_H */
diff --git a/components/file_finder/search.cpp b/components/file_finder/search.cpp
index b05b30e83..eb4392abc 100644
--- a/components/file_finder/search.cpp
+++ b/components/file_finder/search.cpp
@@ -2,27 +2,27 @@
 
 #include <iostream>
 
-using namespace std;
-using namespace boost::filesystem;
-
-void FileFinder::find(const path & dir_path, ReturnPath &ret, bool recurse)
+void FileFinder::find(const boost::filesystem::path & dir_path, ReturnPath &ret, bool recurse)
 {
-  if ( !exists( dir_path ) )
+    if ( !boost::filesystem::exists( dir_path ) )
     {
-      cout << "Path " << dir_path << " not found\n";
+      std::cout << "Path " << dir_path << " not found" << std::endl;
       return;
     }
 
-  directory_iterator end_itr; // default construction yields past-the-end
-  for ( directory_iterator itr(dir_path);
-        itr != end_itr;
-        ++itr )
+    boost::filesystem::directory_iterator end_itr; // default construction yields past-the-end
+    for (boost::filesystem::directory_iterator itr(dir_path); itr != end_itr; ++itr)
     {
-      if ( is_directory( *itr ) )
+        if (boost::filesystem::is_directory( *itr ))
+        {
+            if (recurse)
+            {
+                find(*itr, ret);
+            }
+        }
+        else
         {
-          if(recurse) find(*itr, ret);
+            ret.add(*itr);
         }
-      else
-        ret.add(*itr);
     }
 }
diff --git a/components/files/multidircollection.hpp b/components/files/multidircollection.hpp
index 391f8b6a4..e8abeb45d 100644
--- a/components/files/multidircollection.hpp
+++ b/components/files/multidircollection.hpp
@@ -68,7 +68,7 @@ namespace Files
             /// \param foldCase Ignore filename case
 
             boost::filesystem::path getPath (const std::string& file) const;
-            ///< Return full path (including filename) of \æ file.
+            ///< Return full path (including filename) of \a file.
             ///
             /// If the file does not exist, an exception is thrown. \a file must include
             /// the extension.