diff --git a/tools/src/asset_processor/CMakeLists.txt b/tools/src/asset_processor/CMakeLists.txt
index 387b4ab5..4709cd52 100644
--- a/tools/src/asset_processor/CMakeLists.txt
+++ b/tools/src/asset_processor/CMakeLists.txt
@@ -3,6 +3,6 @@ file(GLOB_RECURSE sources *.cpp)
 add_executable(asset_processor ${sources})
 target_include_directories(asset_processor PRIVATE .)
 target_link_libraries(asset_processor PRIVATE project_settings)
-target_link_libraries(asset_processor PRIVATE fmt::fmt nlohmann_json::nlohmann_json filesystem)
+target_link_libraries(asset_processor PRIVATE fmt::fmt nlohmann_json::nlohmann_json filesystem util)
 
 install(TARGETS asset_processor RUNTIME DESTINATION bin)
diff --git a/tools/src/asset_processor/assets/asset.cpp b/tools/src/asset_processor/assets/asset.cpp
index d75f50b9..ff81e810 100644
--- a/tools/src/asset_processor/assets/asset.cpp
+++ b/tools/src/asset_processor/assets/asset.cpp
@@ -1,11 +1,7 @@
 #include "asset.h"
-#include <fstream>
+#include <util/file.h>
 
 void BaseAsset::extractBinary(const std::vector<char>& baserom) {
-    auto first = baserom.begin() + start;
-    auto last = baserom.begin() + start + size;
-    std::vector<char> data(first, last);
-    std::fstream file(path, std::ios::out | std::ios::binary);
-    file.write(&data[0], static_cast<std::streamsize>(data.size()));
-    file.close();
-}
\ No newline at end of file
+    auto file = util::open_file(path.string(), "w");
+    std::fwrite(baserom.data() + start, 1, static_cast<size_t>(size), file.get());
+}
diff --git a/tools/src/asset_processor/assets/midi.cpp b/tools/src/asset_processor/assets/midi.cpp
index 1a3f1852..1c383877 100644
--- a/tools/src/asset_processor/assets/midi.cpp
+++ b/tools/src/asset_processor/assets/midi.cpp
@@ -4,6 +4,7 @@
 #include <filesystem>
 #include <iostream>
 #include <fstream>
+#include <util/file.h>
 #include <nlohmann/json.hpp>
 #include <fmt/format.h>
 
@@ -32,21 +33,13 @@ void MidiAsset::extractBinary(const std::vector<char>& baserom) {
 
     // Extract tracks
     {
-        auto first = baserom.begin() + start;
-        auto last = baserom.begin() + start + headerOffset;
-        std::vector<char> data(first, last);
-        std::fstream file(tracksPath, std::ios::out | std::ios::binary);
-        file.write(&data[0], static_cast<std::streamsize>(data.size()));
-        file.close();
+        auto file = util::open_file(tracksPath.string(), "w");
+        std::fwrite(baserom.data() + start, 1, static_cast<size_t>(headerOffset), file.get());
     }
     // Extract header
     {
-        auto first = baserom.begin() + start + headerOffset;
-        auto last = baserom.begin() + start + size;
-        std::vector<char> data(first, last);
-        std::fstream file(headerPath, std::ios::out | std::ios::binary);
-        file.write(&data[0], static_cast<std::streamsize>(data.size()));
-        file.close();
+        auto file = util::open_file(headerPath.string(), "w");
+        std::fwrite(baserom.data() + start + headerOffset, 1, static_cast<size_t>(size - headerOffset), file.get());
     }
 
     // Create dummy .s file.