diff --git a/src/Common/Serialization/CXMLReader.h b/src/Common/Serialization/CXMLReader.h
index a7995779..01921505 100644
--- a/src/Common/Serialization/CXMLReader.h
+++ b/src/Common/Serialization/CXMLReader.h
@@ -18,17 +18,30 @@ public:
         // Load XML and set current element to the root element; read version
         mDoc.LoadFile(*rkFileName);
         mpCurElem = mDoc.FirstChildElement();
-        ASSERT(mpCurElem != nullptr);
 
-        mArchiveVersion = (u16) TString( mpCurElem->Attribute("ArchiveVer") ).ToInt32(10);
-        mFileVersion = (u16) TString( mpCurElem->Attribute("FileVer") ).ToInt32(10);
-        const char *pkGameAttr = mpCurElem->Attribute("Game");
-        mGame = pkGameAttr ? GetGameForID( CFourCC(pkGameAttr) ) : eUnknownGame;
+        if (mpCurElem != nullptr)
+        {
+            mArchiveVersion = (u16) TString( mpCurElem->Attribute("ArchiveVer") ).ToInt32(10);
+            mFileVersion = (u16) TString( mpCurElem->Attribute("FileVer") ).ToInt32(10);
+            const char *pkGameAttr = mpCurElem->Attribute("Game");
+            mGame = pkGameAttr ? GetGameForID( CFourCC(pkGameAttr) ) : eUnknownGame;
+        }
+        else
+        {
+            Log::Error("Failed to open XML for read: " + rkFileName);
+        }
+    }
+
+    inline bool IsValid() const
+    {
+        return mpCurElem != nullptr;
     }
 
     // Interface
     virtual bool ParamBegin(const char *pkName)
     {
+        ASSERT(IsValid());
+
         // Push new parent if needed
         if (!mJustEndedParam)
         {
diff --git a/src/Common/Serialization/CXMLWriter.h b/src/Common/Serialization/CXMLWriter.h
index 2a828d09..5375dc00 100644
--- a/src/Common/Serialization/CXMLWriter.h
+++ b/src/Common/Serialization/CXMLWriter.h
@@ -11,11 +11,13 @@ class CXMLWriter : public IArchive
     tinyxml2::XMLDocument mDoc;
     TString mOutFilename;
     tinyxml2::XMLElement *mpCurElem;
+    bool mSaved;
 
 public:
     CXMLWriter(const TString& rkFileName, const TString& rkRootName, u16 FileVersion, EGame Game = eUnknownGame)
         : IArchive(false, true)
         , mOutFilename(rkFileName)
+        , mSaved(false)
     {
         SetVersion(skCurrentArchiveVersion, FileVersion, Game);
 
@@ -34,12 +36,43 @@ public:
 
     ~CXMLWriter()
     {
-        mDoc.SaveFile(*mOutFilename);
+        if (!mSaved)
+        {
+            bool SaveSuccess = Save();
+            ASSERT(SaveSuccess);
+        }
+    }
+
+    inline bool Save()
+    {
+        if (mSaved)
+        {
+            Log::Error("Attempted to save XML twice!");
+            return false;
+        }
+
+        tinyxml2::XMLError Error = mDoc.SaveFile(*mOutFilename);
+        mSaved = true;
+
+        if (Error != tinyxml2::XML_SUCCESS)
+        {
+            Log::Error("Failed to save XML file: " + mOutFilename);
+            return false;
+        }
+        else
+            return true;
+    }
+
+    inline bool IsValid() const
+    {
+        return mpCurElem != nullptr && !mSaved;
     }
 
     // Interface
     virtual bool ParamBegin(const char *pkName)
     {
+        ASSERT(IsValid());
+
         tinyxml2::XMLElement *pElem = mDoc.NewElement(pkName);
         mpCurElem->LinkEndChild(pElem);
         mpCurElem = pElem;
diff --git a/src/Core/GameProject/CAssetNameMap.cpp b/src/Core/GameProject/CAssetNameMap.cpp
index 6444d4c6..951b82b0 100644
--- a/src/Core/GameProject/CAssetNameMap.cpp
+++ b/src/Core/GameProject/CAssetNameMap.cpp
@@ -1,15 +1,22 @@
 #include "CAssetNameMap.h"
 
-void CAssetNameMap::LoadAssetNames(TString Path /*= gkAssetMapPath*/)
+bool CAssetNameMap::LoadAssetNames(TString Path /*= gkAssetMapPath*/)
 {
     CXMLReader Reader(Path);
-    Serialize(Reader);
+
+    if (Reader.IsValid())
+    {
+        Serialize(Reader);
+        return true;
+    }
+    else return false;
 }
 
-void CAssetNameMap::SaveAssetNames(TString Path /*= gkAssetMapPath*/)
+bool CAssetNameMap::SaveAssetNames(TString Path /*= gkAssetMapPath*/)
 {
     CXMLWriter Writer(Path, "AssetNameMap", 0, eUnknownGame);
     Serialize(Writer);
+    return Writer.Save();
 }
 
 bool CAssetNameMap::GetNameInfo(CAssetID ID, TString& rOutDirectory, TString& rOutName)
diff --git a/src/Core/GameProject/CAssetNameMap.h b/src/Core/GameProject/CAssetNameMap.h
index 3495d7c4..77197dfa 100644
--- a/src/Core/GameProject/CAssetNameMap.h
+++ b/src/Core/GameProject/CAssetNameMap.h
@@ -50,8 +50,8 @@ class CAssetNameMap
 
 public:
     CAssetNameMap() : mIsValid(true) {}
-    void LoadAssetNames(TString Path = gkAssetMapPath);
-    void SaveAssetNames(TString Path = gkAssetMapPath);
+    bool LoadAssetNames(TString Path = gkAssetMapPath);
+    bool SaveAssetNames(TString Path = gkAssetMapPath);
     bool GetNameInfo(CAssetID ID, TString& rOutDirectory, TString& rOutName);
     void CopyFromStore(CResourceStore *pStore);
 
diff --git a/src/Core/GameProject/CGameExporter.cpp b/src/Core/GameProject/CGameExporter.cpp
index b0a1a5a6..2e91277a 100644
--- a/src/Core/GameProject/CGameExporter.cpp
+++ b/src/Core/GameProject/CGameExporter.cpp
@@ -342,7 +342,8 @@ void CGameExporter::LoadPaks()
         // Add package to project and save
         mpProject->AddPackage(pPackage);
 #if SAVE_PACKAGE_DEFINITIONS
-        pPackage->Save();
+        bool SaveSuccess = pPackage->Save();
+        ASSERT(SaveSuccess);
 #endif
     }
 #endif
@@ -461,7 +462,8 @@ void CGameExporter::ExportCookedResources()
 #if EXPORT_COOKED
         mpStore->SaveResourceDatabase();
 #endif
-        mpProject->Save();
+        bool SaveSuccess = mpProject->Save();
+        ASSERT(SaveSuccess);
     }
 }
 
diff --git a/src/Core/GameProject/CGameInfo.cpp b/src/Core/GameProject/CGameInfo.cpp
index 25558a14..fac3332c 100644
--- a/src/Core/GameProject/CGameInfo.cpp
+++ b/src/Core/GameProject/CGameInfo.cpp
@@ -1,29 +1,35 @@
 #include "CGameInfo.h"
 #include <Common/FileUtil.h>
 
-void CGameInfo::LoadGameInfo(EGame Game)
+bool CGameInfo::LoadGameInfo(EGame Game)
 {
     Game = RoundGame(Game);
     mGame = Game;
 
     TString Path = GetDefaultGameInfoPath(Game);
-    if (FileUtil::Exists(Path))
-        LoadGameInfo(Path);
+    return LoadGameInfo(Path);
 }
 
-void CGameInfo::LoadGameInfo(TString Path)
+bool CGameInfo::LoadGameInfo(TString Path)
 {
     CXMLReader Reader(Path);
-    Serialize(Reader);
+
+    if (Reader.IsValid())
+    {
+        Serialize(Reader);
+        return true;
+    }
+    else return false;
 }
 
-void CGameInfo::SaveGameInfo(TString Path /*= ""*/)
+bool CGameInfo::SaveGameInfo(TString Path /*= ""*/)
 {
     ASSERT(mGame != eUnknownGame); // can't save game info that was never loaded
 
     if (Path.IsEmpty()) Path = GetDefaultGameInfoPath(mGame);
     CXMLWriter Writer(Path, "GameInfo", 0, mGame);
     Serialize(Writer);
+    return Writer.Save();
 }
 
 void CGameInfo::Serialize(IArchive& rArc)
diff --git a/src/Core/GameProject/CGameInfo.h b/src/Core/GameProject/CGameInfo.h
index 8a9227bb..272286cc 100644
--- a/src/Core/GameProject/CGameInfo.h
+++ b/src/Core/GameProject/CGameInfo.h
@@ -21,9 +21,9 @@ public:
         : mGame(eUnknownGame)
     {}
 
-    void LoadGameInfo(EGame Game);
-    void LoadGameInfo(TString Path);
-    void SaveGameInfo(TString Path = "");
+    bool LoadGameInfo(EGame Game);
+    bool LoadGameInfo(TString Path);
+    bool SaveGameInfo(TString Path = "");
     void Serialize(IArchive& rArc);
 
     TString GetAreaName(const CAssetID& rkID) const;
diff --git a/src/Core/GameProject/CGameProject.cpp b/src/Core/GameProject/CGameProject.cpp
index 27b77dea..de535198 100644
--- a/src/Core/GameProject/CGameProject.cpp
+++ b/src/Core/GameProject/CGameProject.cpp
@@ -7,7 +7,10 @@ CGameProject *CGameProject::mspActiveProject = nullptr;
 
 CGameProject::~CGameProject()
 {
-    ASSERT(!mpResourceStore->IsDirty());
+    if (mpResourceStore)
+    {
+        ASSERT(!mpResourceStore->IsDirty());
+    }
 
     if (IsActive())
     {
@@ -15,16 +18,23 @@ CGameProject::~CGameProject()
         gpResourceStore = nullptr;
     }
 
+    for (u32 iPkg = 0; iPkg < mPackages.size(); iPkg++)
+        delete mPackages[iPkg];
+
     delete mpAudioManager;
     delete mpGameInfo;
     delete mpResourceStore;
 }
 
-void CGameProject::Save()
+bool CGameProject::Save()
 {
+    mProjFileLock.Release();
     TString ProjPath = ProjectPath().ToUTF8();
     CXMLWriter Writer(ProjPath, "GameProject", eVer_Current, mGame);
     Serialize(Writer);
+    bool SaveSuccess = Writer.Save();
+    mProjFileLock.Lock(*ProjPath);
+    return SaveSuccess;
 }
 
 void CGameProject::Serialize(IArchive& rArc)
@@ -60,22 +70,31 @@ void CGameProject::Serialize(IArchive& rArc)
         // Load resource store
         ASSERT(mpResourceStore == nullptr);
         mpResourceStore = new CResourceStore(this);
-        mpResourceStore->LoadResourceDatabase();
 
-        // Load packages
-        for (u32 iPkg = 0; iPkg < mPackages.size(); iPkg++)
-            delete mPackages[iPkg];
-        mPackages.clear();
+        if (!mpResourceStore->LoadResourceDatabase())
+            mLoadSuccess = false;
 
-        for (u32 iPkg = 0; iPkg < PackageList.size(); iPkg++)
+        else
         {
-            const TWideString& rkPackagePath = PackageList[iPkg];
-            TString PackageName = TWideString(rkPackagePath.GetFileName(false)).ToUTF8();
-            TWideString PackageDir = rkPackagePath.GetFileDirectory();
+            // Load packages
+            ASSERT(mPackages.empty());
 
-            CPackage *pPackage = new CPackage(this, PackageName, PackageDir);
-            pPackage->Load();
-            mPackages.push_back(pPackage);
+            for (u32 iPkg = 0; iPkg < PackageList.size(); iPkg++)
+            {
+                const TWideString& rkPackagePath = PackageList[iPkg];
+                TString PackageName = TWideString(rkPackagePath.GetFileName(false)).ToUTF8();
+                TWideString PackageDir = rkPackagePath.GetFileDirectory();
+
+                CPackage *pPackage = new CPackage(this, PackageName, PackageDir);
+                bool PackageLoadSuccess = pPackage->Load();
+                mPackages.push_back(pPackage);
+
+                if (!PackageLoadSuccess)
+                {
+                    mLoadSuccess = false;
+                    break;
+                }
+            }
         }
     }
 }
@@ -160,6 +179,7 @@ CGameProject* CGameProject::CreateProjectForExport(
     pProj->mProjectRoot.Replace(L"/", L"\\");
     pProj->mpResourceStore = new CResourceStore(pProj, pExporter, L"Content\\", L"Cooked\\", Game);
     pProj->mpGameInfo->LoadGameInfo(Game);
+    pProj->mLoadSuccess = true;
     return pProj;
 }
 
@@ -171,10 +191,24 @@ CGameProject* CGameProject::LoadProject(const TWideString& rkProjPath)
 
     TString ProjPath = rkProjPath.ToUTF8();
     CXMLReader Reader(ProjPath);
+
+    if (!Reader.IsValid())
+    {
+        delete pProj;
+        return nullptr;
+    }
+
     pProj->mGame = Reader.Game();
     pProj->Serialize(Reader);
-    CTemplateLoader::LoadGameTemplates(pProj->mGame);
 
+    if (!pProj->mLoadSuccess)
+    {
+        delete pProj;
+        return nullptr;
+    }
+
+    CTemplateLoader::LoadGameTemplates(pProj->mGame);
+    pProj->mProjFileLock.Lock(*ProjPath);
     pProj->mpGameInfo->LoadGameInfo(pProj->mGame);
     pProj->mpAudioManager->LoadAssets();
     return pProj;
diff --git a/src/Core/GameProject/CGameProject.h b/src/Core/GameProject/CGameProject.h
index 0b4c2a03..58fca0d0 100644
--- a/src/Core/GameProject/CGameProject.h
+++ b/src/Core/GameProject/CGameProject.h
@@ -6,6 +6,7 @@
 #include "CResourceStore.h"
 #include "Core/CAudioManager.h"
 #include "Core/Resource/Script/CMasterTemplate.h"
+#include <FileIO/CFileLock.h>
 #include <Common/CAssetID.h>
 #include <Common/EGame.h>
 #include <Common/FileUtil.h>
@@ -31,6 +32,11 @@ class CGameProject
     CGameInfo *mpGameInfo;
     CAudioManager *mpAudioManager;
 
+    // Keep file handle open for the .prj file to prevent users from opening the same project
+    // in multiple instances of PWE
+    CFileLock mProjFileLock;
+    bool mLoadSuccess;
+
     enum EProjectVersion
     {
         eVer_Initial,
@@ -50,6 +56,7 @@ class CGameProject
         , mBuildVersion(0.f)
         , mResourceDBPath(L"ResourceDB.rdb")
         , mpResourceStore(nullptr)
+        , mLoadSuccess(true)
     {
         mpGameInfo = new CGameInfo();
         mpAudioManager = new CAudioManager(this);
@@ -58,7 +65,7 @@ class CGameProject
 public:
     ~CGameProject();
 
-    void Save();
+    bool Save();
     void Serialize(IArchive& rArc);
     void SetActive();
     void GetWorldList(std::list<CAssetID>& rOut) const;
diff --git a/src/Core/GameProject/CPackage.cpp b/src/Core/GameProject/CPackage.cpp
index f57d951d..69387d11 100644
--- a/src/Core/GameProject/CPackage.cpp
+++ b/src/Core/GameProject/CPackage.cpp
@@ -10,21 +10,28 @@
 
 using namespace tinyxml2;
 
-void CPackage::Load()
+bool CPackage::Load()
 {
     TWideString DefPath = DefinitionPath(false);
     CXMLReader Reader(DefPath.ToUTF8());
-    Serialize(Reader);
-    UpdateDependencyCache();
+
+    if (Reader.IsValid())
+    {
+        Serialize(Reader);
+        UpdateDependencyCache();
+        return true;
+    }
+    else return false;
 }
 
-void CPackage::Save()
+bool CPackage::Save()
 {
     TWideString DefPath = DefinitionPath(false);
     FileUtil::MakeDirectory(DefPath.GetFileDirectory());
 
     CXMLWriter Writer(DefPath.ToUTF8(), "PackageDefinition", 0, mpProject ? mpProject->Game() : eUnknownGame);
     Serialize(Writer);
+    return Writer.Save();
 }
 
 void CPackage::Serialize(IArchive& rArc)
diff --git a/src/Core/GameProject/CPackage.h b/src/Core/GameProject/CPackage.h
index 459f98fb..5e8504e7 100644
--- a/src/Core/GameProject/CPackage.h
+++ b/src/Core/GameProject/CPackage.h
@@ -71,8 +71,8 @@ public:
         , mNeedsRecook(false)
     {}
 
-    void Load();
-    void Save();
+    bool Load();
+    bool Save();
     void Serialize(IArchive& rArc);
     void UpdateDependencyCache();
 
diff --git a/src/Core/GameProject/CResourceEntry.cpp b/src/Core/GameProject/CResourceEntry.cpp
index 1427ada1..e2f0c852 100644
--- a/src/Core/GameProject/CResourceEntry.cpp
+++ b/src/Core/GameProject/CResourceEntry.cpp
@@ -195,9 +195,17 @@ bool CResourceEntry::Save(bool SkipCacheSave /*= false*/)
 
         TString SerialName = mpTypeInfo->TypeName();
         SerialName.RemoveWhitespace();
+
         CXMLWriter Writer(Path, SerialName, 0, mGame);
         mpResource->Serialize(Writer);
 
+        if (!Writer.Save())
+        {
+            Log::Error("Failed to save raw resource: " + Path);
+            DEBUG_BREAK;
+            return false;
+        }
+
         mFlags |= eREF_NeedsRecook;
     }
 
@@ -286,16 +294,28 @@ CResource* CResourceEntry::Load()
             gpResourceStore = mpStore;
 
             CXMLReader Reader(RawAssetPath());
-            mpResource->Serialize(Reader);
-            mpStore->TrackLoadedResource(this);
 
-            gpResourceStore = pOldStore;
+            if (!Reader.IsValid())
+            {
+                Log::Error("Failed to load raw resource; falling back on cooked. Raw path: " + RawAssetPath());
+                delete mpResource;
+                mpResource = nullptr;
+            }
+
+            else
+            {
+                mpResource->Serialize(Reader);
+                mpStore->TrackLoadedResource(this);
+                gpResourceStore = pOldStore;
+            }
         }
 
-        return mpResource;
+        if (mpResource)
+            return mpResource;
     }
 
-    else if (HasCookedVersion())
+    ASSERT(!mpResource);
+    if (HasCookedVersion())
     {
         CFileInStream File(CookedAssetPath().ToStdString(), IOUtil::eBigEndian);
 
diff --git a/src/Core/GameProject/CResourceStore.cpp b/src/Core/GameProject/CResourceStore.cpp
index 1c8598d6..b1b8b646 100644
--- a/src/Core/GameProject/CResourceStore.cpp
+++ b/src/Core/GameProject/CResourceStore.cpp
@@ -108,7 +108,7 @@ void CResourceStore::SerializeResourceDatabase(IArchive& rArc)
     }
 }
 
-void CResourceStore::LoadResourceDatabase()
+bool CResourceStore::LoadResourceDatabase()
 {
     ASSERT(!mDatabasePath.IsEmpty());
     TString Path = DatabasePath().ToUTF8();
@@ -118,27 +118,45 @@ void CResourceStore::LoadResourceDatabase()
 
     CXMLReader Reader(Path);
 
+    if (!Reader.IsValid())
+    {
+        Log::Error("Failed to open resource database for load: " + Path);
+        return false;
+    }
+
     if (mpProj)
         ASSERT(mpProj->Game() == Reader.Game());
 
     mGame = Reader.Game();
     SerializeResourceDatabase(Reader);
-    LoadCacheFile();
+    return LoadCacheFile();
 }
 
-void CResourceStore::SaveResourceDatabase()
+bool CResourceStore::SaveResourceDatabase()
 {
     TString Path = DatabasePath().ToUTF8();
     CXMLWriter Writer(Path, "ResourceDB", 0, mGame);
     SerializeResourceDatabase(Writer);
-    mDatabaseDirty = false;
+    bool SaveSuccess = Writer.Save();
+
+    if (SaveSuccess)
+        mDatabaseDirty = false;
+    else
+        Log::Error("Failed to save resource database: " + Path);
+
+    return SaveSuccess;
 }
 
-void CResourceStore::LoadCacheFile()
+bool CResourceStore::LoadCacheFile()
 {
     TString CachePath = CacheDataPath().ToUTF8();
     CFileInStream CacheFile(CachePath.ToStdString(), IOUtil::eBigEndian);
-    ASSERT(CacheFile.IsValid());
+
+    if (!CacheFile.IsValid())
+    {
+        Log::Error("Failed to open cache file for load: " + CachePath);
+        return false;
+    }
 
     // Cache header
     CFourCC Magic(CacheFile);
@@ -146,7 +164,7 @@ void CResourceStore::LoadCacheFile()
     if (Magic != "CACH")
     {
         Log::Error("Invalid resource cache data magic: " + Magic.ToString());
-        return;
+        return false;
     }
 
     CSerialVersion Version(CacheFile);
@@ -173,13 +191,19 @@ void CResourceStore::LoadCacheFile()
 
         CacheFile.Seek(EntryCacheEnd, SEEK_SET);
     }
+    return true;
 }
 
-void CResourceStore::SaveCacheFile()
+bool CResourceStore::SaveCacheFile()
 {
     TString CachePath = CacheDataPath().ToUTF8();
     CFileOutStream CacheFile(CachePath.ToStdString(), IOUtil::eBigEndian);
-    ASSERT(CacheFile.IsValid());
+
+    if (!CacheFile.IsValid())
+    {
+        Log::Error("Failed to open cache file for save: " + CachePath);
+        return false;
+    }
 
     // Cache header
     CFourCC("CACH").Write(CacheFile);
@@ -219,6 +243,7 @@ void CResourceStore::SaveCacheFile()
     CacheFile.Seek(ResCountOffset, SEEK_SET);
     CacheFile.WriteLong(ResCount);
     mCacheFileDirty = false;
+    return true;
 }
 
 void CResourceStore::ConditionalSaveStore()
diff --git a/src/Core/GameProject/CResourceStore.h b/src/Core/GameProject/CResourceStore.h
index e5802486..627cccbb 100644
--- a/src/Core/GameProject/CResourceStore.h
+++ b/src/Core/GameProject/CResourceStore.h
@@ -52,10 +52,10 @@ public:
     CResourceStore(CGameProject *pProject);
     ~CResourceStore();
     void SerializeResourceDatabase(IArchive& rArc);
-    void LoadResourceDatabase();
-    void SaveResourceDatabase();
-    void LoadCacheFile();
-    void SaveCacheFile();
+    bool LoadResourceDatabase();
+    bool SaveResourceDatabase();
+    bool LoadCacheFile();
+    bool SaveCacheFile();
     void ConditionalSaveStore();
     void SetProject(CGameProject *pProj);
     void CloseProject();
diff --git a/src/Editor/CExportGameDialog.cpp b/src/Editor/CExportGameDialog.cpp
index 78693aba..770f23ae 100644
--- a/src/Editor/CExportGameDialog.cpp
+++ b/src/Editor/CExportGameDialog.cpp
@@ -335,12 +335,20 @@ void CExportGameDialog::Export()
     CAssetNameMap NameMap;
 
     if (!NameMapPath.isEmpty())
-        NameMap.LoadAssetNames( TO_TSTRING(NameMapPath) );
-
-    if (!NameMap.IsValid())
     {
-        UICommon::ErrorMsg(this, "The Asset Name Map is invalid and cannot be used! See the log for more information.");
-        return;
+        bool LoadSuccess = NameMap.LoadAssetNames( TO_TSTRING(NameMapPath) );
+
+        if (!LoadSuccess)
+        {
+            UICommon::ErrorMsg(this, "Failed to load the asset name map!");
+            return;
+        }
+
+        else if (!NameMap.IsValid())
+        {
+            UICommon::ErrorMsg(this, "The Asset Name Map is invalid and cannot be used! See the log for more information.");
+            return;
+        }
     }
 
     // Verify game info is valid
@@ -350,12 +358,20 @@ void CExportGameDialog::Export()
         return;
     }
 
-    // Do export
-    close();
-
     CGameInfo GameInfo;
     if (!GameInfoPath.isEmpty())
-        GameInfo.LoadGameInfo( TO_TSTRING(GameInfoPath) );
+    {
+        bool LoadSuccess = GameInfo.LoadGameInfo( TO_TSTRING(GameInfoPath) );
+
+        if (!LoadSuccess)
+        {
+            UICommon::ErrorMsg(this, "Failed to load game info!");
+            return;
+        }
+    }
+
+    // Do export
+    close();
 
     CGameExporter Exporter(mGame, mRegion, mGameTitle, mGameID, mBuildVer);
     TString StrExportDir = TO_TSTRING(ExportDir);
diff --git a/src/Editor/CProjectOverviewDialog.cpp b/src/Editor/CProjectOverviewDialog.cpp
index e16d8efa..185144e6 100644
--- a/src/Editor/CProjectOverviewDialog.cpp
+++ b/src/Editor/CProjectOverviewDialog.cpp
@@ -49,7 +49,9 @@ void CProjectOverviewDialog::InternalLoadProject(const QString& rkPath)
     }
 
     else
-        Log::Error("Failed to load project");
+    {
+        UICommon::ErrorMsg(this, "Failed to open project! Is it already open in another Prime World Editor instance?");
+    }
 }
 
 void CProjectOverviewDialog::OpenProject()
diff --git a/src/Editor/ResourceBrowser/CResourceBrowser.cpp b/src/Editor/ResourceBrowser/CResourceBrowser.cpp
index 3bdeef61..115534d7 100644
--- a/src/Editor/ResourceBrowser/CResourceBrowser.cpp
+++ b/src/Editor/ResourceBrowser/CResourceBrowser.cpp
@@ -322,7 +322,18 @@ void CResourceBrowser::OnGenerateAssetNames()
 void CResourceBrowser::OnImportNamesFromAssetNameMap()
 {
     CAssetNameMap Map;
-    Map.LoadAssetNames();
+    bool LoadSuccess = Map.LoadAssetNames();
+
+    if (!LoadSuccess)
+    {
+        UICommon::ErrorMsg(this, "Import failed; couldn't load asset name map!");
+        return;
+    }
+    else if (!Map.IsValid())
+    {
+        UICommon::ErrorMsg(this, "Import failed; the input asset name map is invalid! See the log for details.");
+        return;
+    }
 
     for (CResourceIterator It(mpStore); It; ++It)
     {
@@ -335,6 +346,7 @@ void CResourceBrowser::OnImportNamesFromAssetNameMap()
     mpStore->ConditionalSaveStore();
     RefreshResources();
     RefreshDirectories();
+    UICommon::InfoMsg(this, "Success", "New asset names imported successfully!");
 }
 
 void CResourceBrowser::ExportAssetNames()
@@ -346,10 +358,29 @@ void CResourceBrowser::ExportAssetNames()
     CAssetNameMap NameMap;
 
     if (FileUtil::Exists(OutFileStr))
-        NameMap.LoadAssetNames(OutFileStr);
+    {
+        bool LoadSuccess = NameMap.LoadAssetNames(OutFileStr);
+
+        if (!LoadSuccess)
+        {
+            UICommon::ErrorMsg(this, "Unable to export; failed to load existing names from the original asset name map file!");
+            return;
+        }
+
+        else if (!NameMap.IsValid())
+        {
+            UICommon::ErrorMsg(this, "Unable to export; the original asset name map file is invalid! See the log for details.");
+            return;
+        }
+    }
 
     NameMap.CopyFromStore(mpStore);
-    NameMap.SaveAssetNames(OutFileStr);
+    bool SaveSuccess = NameMap.SaveAssetNames(OutFileStr);
+
+    if (SaveSuccess)
+        UICommon::ErrorMsg(this, "Failed to export asset names!");
+    else
+        UICommon::InfoMsg(this, "Success", "Asset names exported successfully!");
 }
 
 void CResourceBrowser::UpdateFilter()
diff --git a/src/Editor/UICommon.h b/src/Editor/UICommon.h
index 65774903..bad19c20 100644
--- a/src/Editor/UICommon.h
+++ b/src/Editor/UICommon.h
@@ -102,6 +102,11 @@ inline QString OpenDirDialog(QWidget *pParent, const QString& rkCaption, const Q
 }
 
 // QMessageBox wrappers
+inline void InfoMsg(QWidget *pParent, QString InfoBoxTitle, QString InfoText)
+{
+    QMessageBox::information(pParent, InfoBoxTitle, InfoText);
+}
+
 inline void ErrorMsg(QWidget *pParent, QString ErrorText)
 {
     QMessageBox::warning(pParent, "Error", ErrorText);
diff --git a/src/FileIO/CFileLock.h b/src/FileIO/CFileLock.h
new file mode 100644
index 00000000..28d6e3aa
--- /dev/null
+++ b/src/FileIO/CFileLock.h
@@ -0,0 +1,34 @@
+#ifndef CFILELOCK_H
+#define CFILELOCK_H
+
+#include <cstdio>
+
+// Maintain a file handle to prevent other processes from accessing the file.
+class CFileLock
+{
+    FILE* mpFile;
+
+public:
+    CFileLock()
+        : mpFile(nullptr)
+    {}
+
+    ~CFileLock()
+    {
+        Release();
+    }
+
+    void Lock(const char *pkPath)
+    {
+        Release();
+        mpFile = fopen(pkPath, "a+");
+    }
+
+    void Release()
+    {
+        if (mpFile)
+            fclose(mpFile);
+    }
+};
+
+#endif // CFILELOCK_H
diff --git a/src/FileIO/FileIO.pro b/src/FileIO/FileIO.pro
index 83af5dd8..2acf25e0 100644
--- a/src/FileIO/FileIO.pro
+++ b/src/FileIO/FileIO.pro
@@ -41,7 +41,8 @@ HEADERS += \
     IOUtil.h \
     IInputStream.h \
     IOutputStream.h \
-    CBitStreamInWrapper.h
+    CBitStreamInWrapper.h \
+    CFileLock.h
 
 # Source Files
 SOURCES += \
diff --git a/templates/mp1/Enums/VulnerabilityType.xml b/templates/mp1/Enums/VulnerabilityType.xml
index 5934b074..d455fd43 100644
--- a/templates/mp1/Enums/VulnerabilityType.xml
+++ b/templates/mp1/Enums/VulnerabilityType.xml
@@ -7,7 +7,7 @@
         <enumerator ID="0x03" name="Immune"/>
         <enumerator ID="0x04" name="Pass Through"/>
         <enumerator ID="0x05" name="Direct/Double"/>
-        <enumerator ID="0x06" name="Direct"/>
-        <enumerator ID="0x07" name="Immune?"/>
+        <enumerator ID="0x06" name="Direct/Normal"/>
+        <enumerator ID="0x07" name="Direct/Immune"/>
     </enumerators>
 </enum>