diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3ba9a35..5946e9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,6 +36,8 @@ set(ZDRAY_SOURCES
 	src/framework/file.h
 	src/framework/utf16.cpp
 	src/framework/utf16.h
+	src/framework/filesystem.cpp
+	src/framework/filesystem.h
 	src/blockmapbuilder/blockmapbuilder.cpp
 	src/blockmapbuilder/blockmapbuilder.h
 	src/level/level.cpp
diff --git a/src/framework/textureid.cpp b/src/framework/textureid.cpp
index d3ba79a..499dabf 100644
--- a/src/framework/textureid.cpp
+++ b/src/framework/textureid.cpp
@@ -1,5 +1,4 @@
 
 #include "textureid.h"
 
-FFileSystem fileSystem;
 FTextureManager TexMan;
diff --git a/src/framework/textureid.h b/src/framework/textureid.h
index d3c9cd1..585bb40 100644
--- a/src/framework/textureid.h
+++ b/src/framework/textureid.h
@@ -3,6 +3,7 @@
 #include "framework/tarray.h"
 #include "framework/templates.h"
 #include "framework/zstring.h"
+#include "framework/filesystem.h"
 #include <map>
 #include <memory>
 
@@ -71,24 +72,6 @@ class FSetTextureID : public FTextureID
 	constexpr FSetTextureID(int v) : FTextureID(v) {}
 };
 
-
-
-struct FileData
-{
-	char* GetMem() { return nullptr; }
-};
-
-class FFileSystem
-{
-public:
-	int CheckNumForFullName(const FString& fullname) { return -1; }
-	int FileLength(int lump) { return 0; }
-	FileData ReadFile(int lump) { return {}; }
-	const char* GetFileFullName(int lump, bool returnshort = true) const { return ""; }
-};
-
-extern FFileSystem fileSystem;
-
 class FGameTexture
 {
 public:
diff --git a/src/framework/zipreader.cpp b/src/framework/zipreader.cpp
index 626a2cf..4b44d44 100644
--- a/src/framework/zipreader.cpp
+++ b/src/framework/zipreader.cpp
@@ -24,6 +24,19 @@ class ZipReaderImpl : public ZipReader
 		mz_zip_reader_end(&zip);
 	}
 
+	int get_num_files() override
+	{
+		return mz_zip_reader_get_num_files(&zip);
+	}
+
+	std::string get_filename(int file_index) override
+	{
+		std::string filename;
+		filename.resize((size_t)mz_zip_reader_get_filename(&zip, (mz_uint)file_index, nullptr, 0));
+		mz_zip_reader_get_filename(&zip, file_index, filename.data(), (mz_uint)filename.size());
+		return filename;
+	}
+
 	bool file_exists(const std::string& filename) override
 	{
 		mz_uint32 fileIndex;
@@ -31,26 +44,34 @@ class ZipReaderImpl : public ZipReader
 		return result;
 	}
 
+	uint64_t get_uncompressed_size(int file_index) override
+	{
+		mz_zip_archive_file_stat stat;
+		mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
+		if (result == MZ_FALSE)
+			throw std::runtime_error("mz_zip_reader_file_stat failed");
+		return (uint64_t)stat.m_uncomp_size;
+	}
+
 	uint32_t get_crc32(const std::string& filename) override
 	{
 		int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
 		if (file_index == -1)
 			throw std::runtime_error("File " + filename + " not found in archive");
+		return get_crc32(file_index);
+	}
 
+	uint32_t get_crc32(int file_index) override
+	{
 		mz_zip_archive_file_stat stat;
 		mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
 		if (result == MZ_FALSE)
 			throw std::runtime_error("mz_zip_reader_file_stat failed");
-
 		return stat.m_crc32;
 	}
 
-	std::vector<uint8_t> read_all_bytes(const std::string& filename) override
+	std::vector<uint8_t> read_all_bytes(int file_index) override
 	{
-		int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
-		if (file_index == -1)
-			throw std::runtime_error("File " + filename + " not found in archive");
-
 		mz_zip_archive_file_stat stat;
 		mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
 		if (result == MZ_FALSE)
@@ -66,12 +87,8 @@ class ZipReaderImpl : public ZipReader
 		return buffer;
 	}
 
-	std::string read_all_text(const std::string& filename) override
+	std::string read_all_text(int file_index) override
 	{
-		int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
-		if (file_index == -1)
-			throw std::runtime_error("File " + filename + " not found in archive");
-
 		mz_zip_archive_file_stat stat;
 		mz_bool result = mz_zip_reader_file_stat(&zip, file_index, &stat);
 		if (result == MZ_FALSE)
@@ -88,6 +105,27 @@ class ZipReaderImpl : public ZipReader
 		return buffer;
 	}
 
+	int locate_file(const std::string& filename) override
+	{
+		return mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
+	}
+
+	std::vector<uint8_t> read_all_bytes(const std::string& filename) override
+	{
+		int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
+		if (file_index == -1)
+			throw std::runtime_error("File " + filename + " not found in archive");
+		return read_all_bytes(file_index);
+	}
+
+	std::string read_all_text(const std::string& filename) override
+	{
+		int file_index = mz_zip_reader_locate_file(&zip, filename.c_str(), nullptr, 0);
+		if (file_index == -1)
+			throw std::runtime_error("File " + filename + " not found in archive");
+		return read_all_text(file_index);
+	}
+
 	static size_t read(void* pOpaque, mz_uint64 file_ofs, void* pBuf, size_t n)
 	{
 		ZipReaderImpl* impl = static_cast<ZipReaderImpl*>(pOpaque);
diff --git a/src/framework/zipreader.h b/src/framework/zipreader.h
index fc4fd91..071a826 100644
--- a/src/framework/zipreader.h
+++ b/src/framework/zipreader.h
@@ -12,6 +12,14 @@ class ZipReader
 
 	virtual ~ZipReader() = default;
 
+	virtual int get_num_files() = 0;
+	virtual std::string get_filename(int file_index) = 0;
+	virtual uint64_t get_uncompressed_size(int file_index) = 0;
+	virtual uint32_t get_crc32(int file_index) = 0;
+	virtual std::vector<uint8_t> read_all_bytes(int file_index) = 0;
+	virtual std::string read_all_text(int file_index) = 0;
+	virtual int locate_file(const std::string& filename) = 0;
+
 	virtual bool file_exists(const std::string& filename) = 0;
 	virtual uint32_t get_crc32(const std::string& filename) = 0;
 	virtual std::vector<uint8_t> read_all_bytes(const std::string& filename) = 0;