diff --git a/src/art.h b/src/art.h
index 123cfa3..c537fdb 100644
--- a/src/art.h
+++ b/src/art.h
@@ -7,6 +7,9 @@
 #include "obj_types.h"
 #include "proto_types.h"
 
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
 typedef enum Head {
     HEAD_INVALID,
     HEAD_MARCUS,
diff --git a/src/audio_file.cc b/src/audio_file.cc
index e090348..64a85b4 100644
--- a/src/audio_file.cc
+++ b/src/audio_file.cc
@@ -9,6 +9,9 @@
 #include <stdio.h>
 #include <string.h>
 
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
 // 0x5108C0
 AudioFileIsCompressedProc* _queryCompressedFunc_2 = _defaultCompressionFunc__;
 
diff --git a/src/file_utils.cc b/src/file_utils.cc
index de06e2c..dd48204 100644
--- a/src/file_utils.cc
+++ b/src/file_utils.cc
@@ -5,7 +5,8 @@
 
 #include <stdio.h>
 #include <zlib.h>
-#include <fstream>
+
+#include <filesystem>
 
 // 0x452740
 int fileCopyDecompressed(const char* existingFilePath, const char* newFilePath)
@@ -142,8 +143,6 @@ int _gzdecompress_file(const char* existingFilePath, const char* newFilePath)
 
 void fileCopy(const char* existingFilePath, const char* newFilePath)
 {
-    std::ifstream source { existingFilePath, std::ios::binary };
-    std::ofstream destination { newFilePath, std::ios::binary };
-
-    destination << source.rdbuf();
+    std::error_code ec;
+    std::filesystem::copy_file(std::filesystem::path(existingFilePath), std::filesystem::path(newFilePath), ec);
 }