diff --git a/apps/bsatool/bsatool.cpp b/apps/bsatool/bsatool.cpp
index 4057d627c4..24c98fd139 100644
--- a/apps/bsatool/bsatool.cpp
+++ b/apps/bsatool/bsatool.cpp
@@ -151,62 +151,11 @@ bool parseOptions (int argc, char** argv, Arguments &info)
     return true;
 }
 
-int list(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info);
-int extract(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info);
-int extractAll(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info);
-int add(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info);
-
-int main(int argc, char** argv)
-{
-    try
-    {
-        Arguments info;
-        if(!parseOptions (argc, argv, info))
-            return 1;
-
-        // Open file
-        std::unique_ptr<Bsa::BSAFile> bsa;
-
-        Bsa::BsaVersion bsaVersion = Bsa::CompressedBSAFile::detectVersion(info.filename);
-
-        if (bsaVersion == Bsa::BSAVER_COMPRESSED)
-            bsa = std::make_unique<Bsa::CompressedBSAFile>(Bsa::CompressedBSAFile());
-        else
-            bsa = std::make_unique<Bsa::BSAFile>(Bsa::BSAFile());
-
-        if (info.mode == "create")
-        {
-            bsa->open(info.filename);
-            return 0;
-        }
-
-        bsa->open(info.filename);
-
-        if (info.mode == "list")
-            return list(bsa, info);
-        else if (info.mode == "extract")
-            return extract(bsa, info);
-        else if (info.mode == "extractall")
-            return extractAll(bsa, info);
-        else if (info.mode == "add")
-            return add(bsa, info);
-        else
-        {
-            std::cout << "Unsupported mode. That is not supposed to happen." << std::endl;
-            return 1;
-        }
-    }
-    catch (std::exception& e)
-    {
-        std::cerr << "ERROR reading BSA archive\nDetails:\n" << e.what() << std::endl;
-        return 2;
-    }
-}
-
-int list(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
+template<typename File>
+int list(std::unique_ptr<File>& bsa, Arguments& info)
 {
     // List all files
-    const Bsa::BSAFile::FileList &files = bsa->getList();
+    const auto &files = bsa->getList();
     for (const auto& file : files)
     {
         if(info.longformat)
@@ -225,7 +174,8 @@ int list(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
     return 0;
 }
 
-int extract(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
+template<typename File>
+int extract(std::unique_ptr<File>& bsa, Arguments& info)
 {
     std::string archivePath = info.extractfile;
     Misc::StringUtils::replaceAll(archivePath, "/", "\\");
@@ -281,7 +231,8 @@ int extract(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
     return 0;
 }
 
-int extractAll(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
+template<typename File>
+int extractAll(std::unique_ptr<File>& bsa, Arguments& info)
 {
     for (const auto &file : bsa->getList())
     {
@@ -315,10 +266,62 @@ int extractAll(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
     return 0;
 }
 
-int add(std::unique_ptr<Bsa::BSAFile>& bsa, Arguments& info)
+template<typename File>
+int add(std::unique_ptr<File>& bsa, Arguments& info)
 {
     boost::filesystem::fstream stream(info.addfile, std::ios_base::binary | std::ios_base::out | std::ios_base::in);
     bsa->addFile(info.addfile, stream);
 
     return 0;
 }
+
+template<typename File>
+int call(Arguments& info)
+{
+    std::unique_ptr<File> bsa = std::make_unique<File>();
+    if (info.mode == "create")
+    {
+        bsa->open(info.filename);
+        return 0;
+    }
+
+    bsa->open(info.filename);
+
+    if (info.mode == "list")
+        return list(bsa, info);
+    else if (info.mode == "extract")
+        return extract(bsa, info);
+    else if (info.mode == "extractall")
+        return extractAll(bsa, info);
+    else if (info.mode == "add")
+        return add(bsa, info);
+    else
+    {
+        std::cout << "Unsupported mode. That is not supposed to happen." << std::endl;
+        return 1;
+    }
+}
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        Arguments info;
+        if (!parseOptions(argc, argv, info))
+            return 1;
+
+        // Open file
+
+        Bsa::BsaVersion bsaVersion = Bsa::CompressedBSAFile::detectVersion(info.filename);
+
+        if (bsaVersion == Bsa::BSAVER_COMPRESSED)
+            return call<Bsa::CompressedBSAFile>(info);
+        else
+            return call<Bsa::BSAFile>(info);
+    }
+    catch (std::exception& e)
+    {
+        std::cerr << "ERROR reading BSA archive\nDetails:\n" << e.what() << std::endl;
+        return 2;
+    }
+}
diff --git a/components/bsa/bsa_file.hpp b/components/bsa/bsa_file.hpp
index f6c5d03139..83e9ae954c 100644
--- a/components/bsa/bsa_file.hpp
+++ b/components/bsa/bsa_file.hpp
@@ -128,7 +128,7 @@ public:
         return Files::openConstrainedFileStream (mFilename.c_str (), file->offset, file->fileSize);
     }
 
-    virtual void addFile(const std::string& filename, std::istream& file);
+    void addFile(const std::string& filename, std::istream& file);
 
     /// Get a list of all files
     /// @note Thread safe.
diff --git a/components/bsa/compressedbsafile.hpp b/components/bsa/compressedbsafile.hpp
index f19815dcf3..2c0b3c0aac 100644
--- a/components/bsa/compressedbsafile.hpp
+++ b/components/bsa/compressedbsafile.hpp
@@ -39,7 +39,7 @@ namespace Bsa
         BSAVER_COMPRESSED = 0x415342 //B, S, A
     };
 
-    class CompressedBSAFile : public BSAFile
+    class CompressedBSAFile : private BSAFile
     {
     private:
         //special marker for invalid records,
@@ -85,6 +85,10 @@ namespace Bsa
         static std::uint64_t generateHash(std::string stem, std::string extension) ;
         Files::IStreamPtr getFile(const FileRecord& fileRecord);
     public:
+        using BSAFile::open;
+        using BSAFile::getList;
+        using BSAFile::getFilename;
+
         CompressedBSAFile();
         virtual ~CompressedBSAFile();
 
@@ -96,7 +100,7 @@ namespace Bsa
        
         Files::IStreamPtr getFile(const char* filePath);
         Files::IStreamPtr getFile(const FileStruct* fileStruct);
-        void addFile(const std::string& filename, std::istream& file) override;
+        void addFile(const std::string& filename, std::istream& file);
     };
 }
 
diff --git a/components/vfs/bsaarchive.cpp b/components/vfs/bsaarchive.cpp
index b0caa5c305..d4d1a5a38b 100644
--- a/components/vfs/bsaarchive.cpp
+++ b/components/vfs/bsaarchive.cpp
@@ -8,7 +8,7 @@ namespace VFS
 
 BsaArchive::BsaArchive(const std::string &filename)
 {
-    mFile = std::make_unique<Bsa::BSAFile>(Bsa::BSAFile());
+    mFile = std::make_unique<Bsa::BSAFile>();
     mFile->open(filename);
 
     const Bsa::BSAFile::FileList &filelist = mFile->getList();
@@ -53,17 +53,30 @@ std::string BsaArchive::getDescription() const
     return std::string{"BSA: "} + mFile->getFilename();
 }
 
+// ------------------------------------------------------------------------------
+
+BsaArchiveFile::BsaArchiveFile(const Bsa::BSAFile::FileStruct *info, Bsa::BSAFile* bsa)
+    : mInfo(info)
+    , mFile(bsa)
+{
+
+}
+
+Files::IStreamPtr BsaArchiveFile::open()
+{
+    return mFile->getFile(mInfo);
+}
+
 CompressedBsaArchive::CompressedBsaArchive(const std::string &filename)
-    : BsaArchive()
+    : Archive()
 {
-    mFile = std::make_unique<Bsa::BSAFile>(Bsa::CompressedBSAFile());
-    mFile->open(filename);
+    mCompressedFile = std::make_unique<Bsa::CompressedBSAFile>();
+    mCompressedFile->open(filename);
 
-    const Bsa::BSAFile::FileList &filelist = mFile->getList();
+    const Bsa::BSAFile::FileList &filelist = mCompressedFile->getList();
     for(Bsa::BSAFile::FileList::const_iterator it = filelist.begin();it != filelist.end();++it)
     {
-        mResources.emplace_back(&*it, mFile.get());
-        mCompressedResources.emplace_back(&*it, static_cast<Bsa::CompressedBSAFile*>(mFile.get()));
+        mCompressedResources.emplace_back(&*it, mCompressedFile.get());
     }
 }
 
@@ -78,22 +91,26 @@ void CompressedBsaArchive::listResources(std::map<std::string, File *> &out, cha
     }
 }
 
-// ------------------------------------------------------------------------------
-
-BsaArchiveFile::BsaArchiveFile(const Bsa::BSAFile::FileStruct *info, Bsa::BSAFile* bsa)
-    : mInfo(info)
-    , mFile(bsa)
+bool CompressedBsaArchive::contains(const std::string& file, char (*normalize_function)(char)) const
 {
-
+    for (const auto& it : mCompressedResources)
+    {
+        std::string ent = it.mInfo->name();
+        std::transform(ent.begin(), ent.end(), ent.begin(), normalize_function);
+        if(file == ent)
+            return true;
+    }
+    return false;
 }
 
-Files::IStreamPtr BsaArchiveFile::open()
+std::string CompressedBsaArchive::getDescription() const
 {
-    return mFile->getFile(mInfo);
+    return std::string{"BSA: "} + mCompressedFile->getFilename();
 }
 
+
 CompressedBsaArchiveFile::CompressedBsaArchiveFile(const Bsa::BSAFile::FileStruct *info, Bsa::CompressedBSAFile* bsa)
-    : BsaArchiveFile(info, bsa)
+    : mInfo(info)
     , mCompressedFile(bsa)
 {
 
diff --git a/components/vfs/bsaarchive.hpp b/components/vfs/bsaarchive.hpp
index 1015f8d220..1bf9cf4381 100644
--- a/components/vfs/bsaarchive.hpp
+++ b/components/vfs/bsaarchive.hpp
@@ -19,12 +19,14 @@ namespace VFS
         Bsa::BSAFile* mFile;
     };
 
-    class CompressedBsaArchiveFile : public BsaArchiveFile
+    class CompressedBsaArchiveFile : public File
     {
     public:
         CompressedBsaArchiveFile(const Bsa::BSAFile::FileStruct* info, Bsa::CompressedBSAFile* bsa);
 
         Files::IStreamPtr open() override;
+
+        const Bsa::BSAFile::FileStruct* mInfo;
         Bsa::CompressedBSAFile* mCompressedFile;
     };
 
@@ -44,12 +46,14 @@ namespace VFS
         std::vector<BsaArchiveFile> mResources;
     };
 
-    class CompressedBsaArchive : public BsaArchive
+    class CompressedBsaArchive : public Archive
     {
     public:
         CompressedBsaArchive(const std::string& filename);
-        void listResources(std::map<std::string, File*>& out, char (*normalize_function) (char)) override;
         virtual ~CompressedBsaArchive() {}
+        void listResources(std::map<std::string, File*>& out, char (*normalize_function) (char)) override;
+        bool contains(const std::string& file, char (*normalize_function) (char)) const override;
+        std::string getDescription() const override;
 
     private:
         std::unique_ptr<Bsa::CompressedBSAFile> mCompressedFile;