diff --git a/tools/src/asset_processor/assets/animation.cpp b/tools/src/asset_processor/assets/animation.cpp
index 1fbd0d43..73923e3f 100644
--- a/tools/src/asset_processor/assets/animation.cpp
+++ b/tools/src/asset_processor/assets/animation.cpp
@@ -1,8 +1,7 @@
 #include "animation.h"
 #include "reader.h"
-#include <fstream>
-#include <iostream>
 #include <fmt/format.h>
+#include <util/file.h>
 
 void AnimationAsset::convertToHumanReadable(const std::vector<char>& baserom) {
     Reader reader(baserom, start, size);
@@ -29,9 +28,8 @@ void AnimationAsset::convertToHumanReadable(const std::vector<char>& baserom) {
         u8 keyframe_count = reader.read_u8();
         lines.push_back(fmt::format("\t.byte {} @ keyframe count\n", keyframe_count));
     }
-    std::ofstream out(assetPath);
+    auto file = util::open_file(assetPath, "w");
     for (const auto& line : lines) {
-        out << line;
+        std::fputs(line.c_str(), file.get());
     }
-    out.close();
 }
diff --git a/tools/src/asset_processor/assets/asset.cpp b/tools/src/asset_processor/assets/asset.cpp
index ff81e810..ebb0d700 100644
--- a/tools/src/asset_processor/assets/asset.cpp
+++ b/tools/src/asset_processor/assets/asset.cpp
@@ -2,6 +2,6 @@
 #include <util/file.h>
 
 void BaseAsset::extractBinary(const std::vector<char>& baserom) {
-    auto file = util::open_file(path.string(), "w");
+    auto file = util::open_file(path, "w");
     std::fwrite(baserom.data() + start, 1, static_cast<size_t>(size), file.get());
 }
diff --git a/tools/src/asset_processor/assets/exitlist.cpp b/tools/src/asset_processor/assets/exitlist.cpp
index ad71dba7..f73d4a0c 100644
--- a/tools/src/asset_processor/assets/exitlist.cpp
+++ b/tools/src/asset_processor/assets/exitlist.cpp
@@ -1,8 +1,7 @@
 #include "exitlist.h"
 #include "reader.h"
-#include <fstream>
-#include <iostream>
 #include <fmt/format.h>
+#include <util/file.h>
 
 void ExitListAsset::convertToHumanReadable(const std::vector<char>& baserom) {
     Reader reader(baserom, start, size);
@@ -41,9 +40,8 @@ void ExitListAsset::convertToHumanReadable(const std::vector<char>& baserom) {
         lines.emplace_back("\n");
     }
 
-    std::ofstream out(assetPath);
+    auto file = util::open_file(assetPath, "w");
     for (const auto& line : lines) {
-        out << line;
+        std::fputs(line.c_str(), file.get());
     }
-    out.close();
 }
\ No newline at end of file
diff --git a/tools/src/asset_processor/assets/frameobjlists.cpp b/tools/src/asset_processor/assets/frameobjlists.cpp
index f196abae..db1b80ca 100644
--- a/tools/src/asset_processor/assets/frameobjlists.cpp
+++ b/tools/src/asset_processor/assets/frameobjlists.cpp
@@ -1,9 +1,8 @@
 #include "frameobjlists.h"
 #include "reader.h"
 #include <algorithm>
-#include <fstream>
-#include <iostream>
 #include <fmt/format.h>
+#include <util/file.h>
 
 void FrameObjListsAsset::convertToHumanReadable(const std::vector<char>& baserom) {
     Reader reader(baserom, start, size);
@@ -73,9 +72,8 @@ void FrameObjListsAsset::convertToHumanReadable(const std::vector<char>& baserom
         }
     }
 
-    std::ofstream out(assetPath);
+    auto file = util::open_file(assetPath, "w");
     for (const auto& line : lines) {
-        out << line;
+        std::fputs(line.c_str(), file.get());
     }
-    out.close();
 }
\ No newline at end of file
diff --git a/tools/src/asset_processor/assets/macroasm.cpp b/tools/src/asset_processor/assets/macroasm.cpp
index f20d48ec..c64df2e1 100644
--- a/tools/src/asset_processor/assets/macroasm.cpp
+++ b/tools/src/asset_processor/assets/macroasm.cpp
@@ -1,5 +1,6 @@
 #include "macroasm.h"
-#include <fstream>
+#include <fmt/format.h>
+#include <util/file.h>
 
 std::filesystem::path BaseMacroAsmAsset::generateAssetPath() {
     std::filesystem::path asset_path = path;
@@ -14,7 +15,6 @@ std::filesystem::path BaseMacroAsmAsset::generateBuildPath() {
 void BaseMacroAsmAsset::extractBinary(const std::vector<char>& baserom) {
     BaseAsset::extractBinary(baserom);
     // Create dummy .s file that just incbins the .bin file.
-    std::ofstream out(assetPath);
-    out << "\t.incbin " << path << "\n";
-    out.close();
+    auto file = util::open_file(assetPath, "w");
+    fmt::print(file.get(), "\t.incbin \"{}\"\n", path.native());
 }
\ No newline at end of file
diff --git a/tools/src/asset_processor/assets/midi.cpp b/tools/src/asset_processor/assets/midi.cpp
index 1c383877..1bc575fb 100644
--- a/tools/src/asset_processor/assets/midi.cpp
+++ b/tools/src/asset_processor/assets/midi.cpp
@@ -2,11 +2,9 @@
 #include "reader.h"
 #include "util.h"
 #include <filesystem>
-#include <iostream>
-#include <fstream>
-#include <util/file.h>
 #include <nlohmann/json.hpp>
 #include <fmt/format.h>
+#include <util/file.h>
 
 extern std::string gBaseromPath;
 
@@ -33,21 +31,20 @@ void MidiAsset::extractBinary(const std::vector<char>& baserom) {
 
     // Extract tracks
     {
-        auto file = util::open_file(tracksPath.string(), "w");
+        auto file = util::open_file(tracksPath, "w");
         std::fwrite(baserom.data() + start, 1, static_cast<size_t>(headerOffset), file.get());
     }
     // Extract header
     {
-        auto file = util::open_file(headerPath.string(), "w");
+        auto file = util::open_file(headerPath, "w");
         std::fwrite(baserom.data() + start + headerOffset, 1, static_cast<size_t>(size - headerOffset), file.get());
     }
 
     // Create dummy .s file.
-    std::ofstream out(buildPath);
-    out << "\t.incbin " << tracksPath << "\n";
-    out << label << "::\n";
-    out << "\t.incbin " << headerPath << "\n";
-    out.close();
+    auto file = util::open_file(buildPath, "w");
+    fmt::print(file.get(), "\t.incbin \"{}\"\n", tracksPath.native());
+    fmt::print(file.get(), "{}::\n", label);
+    fmt::print(file.get(), "\t.incbin \"{}\"\n", headerPath.native());
 }
 
 void MidiAsset::parseOptions(std::vector<std::string>& commonParams, std::vector<std::string>& agb2midParams) {
diff --git a/tools/src/asset_processor/assets/spriteframe.cpp b/tools/src/asset_processor/assets/spriteframe.cpp
index 5c303e4b..24e69a4a 100644
--- a/tools/src/asset_processor/assets/spriteframe.cpp
+++ b/tools/src/asset_processor/assets/spriteframe.cpp
@@ -1,8 +1,7 @@
 #include "spriteframe.h"
 #include "reader.h"
-#include <fstream>
-#include <iostream>
 #include <fmt/format.h>
+#include <util/file.h>
 
 void SpriteFrameAsset::convertToHumanReadable(const std::vector<char>& baserom) {
     Reader reader(baserom, start, size);
@@ -18,9 +17,8 @@ void SpriteFrameAsset::convertToHumanReadable(const std::vector<char>& baserom)
         lines.emplace_back("\n");
     }
 
-    std::ofstream out(assetPath);
+    auto file = util::open_file(assetPath, "w");
     for (const auto& line : lines) {
-        out << line;
+        std::fputs(line.c_str(), file.get());
     }
-    out.close();
 }
\ No newline at end of file
diff --git a/tools/src/asset_processor/offsets.h b/tools/src/asset_processor/offsets.h
index 2117e804..83c41dac 100644
--- a/tools/src/asset_processor/offsets.h
+++ b/tools/src/asset_processor/offsets.h
@@ -9,7 +9,7 @@ class OffsetCalculator {
   public:
     OffsetCalculator(const std::filesystem::path& offsetsFile, int baseOffset_);
     void addAsset(int start, const std::string& symbol);
-    int getLastEnd() const {
+    [[nodiscard]] int getLastEnd() const {
         return lastEnd;
     }
     void setLastEnd(int lastEnd_) {
diff --git a/tools/src/util/util/file.h b/tools/src/util/util/file.h
index e7054826..9c3c0132 100644
--- a/tools/src/util/util/file.h
+++ b/tools/src/util/util/file.h
@@ -3,7 +3,9 @@
 
 #include <cstdio>
 #include <memory>
+#include <string>
 #include <string_view>
+
 namespace util {
 namespace {
 auto file_ptr_deleter = [](std::FILE* file) { std::fclose(file); };
@@ -11,8 +13,13 @@ auto file_ptr_deleter = [](std::FILE* file) { std::fclose(file); };
 
 using file_ptr_t = std::unique_ptr<std::FILE, decltype(file_ptr_deleter)>;
 
-file_ptr_t open_file(std::string_view filename, std::string_view mode) {
+inline file_ptr_t open_file(std::string_view filename, std::string_view mode) {
     return { std::fopen(filename.data(), mode.data()), file_ptr_deleter };
 }
+
+inline file_ptr_t open_file(const std::string& filename, std::string_view mode) {
+    return { std::fopen(filename.c_str(), mode.data()), file_ptr_deleter };
+}
+
 } // namespace util
 #endif // TOOLS_FILE_H