diff --git a/Source/File/FileCreation.cpp b/Source/File/FileCreation.cpp
new file mode 100644
index 0000000..f22af76
--- /dev/null
+++ b/Source/File/FileCreation.cpp
@@ -0,0 +1,51 @@
+#include "File/FileCreation.h"
+#include "Utility/Text/FormatString.h"
+
+#include <cstdlib>
+#include <direct.h>
+#include <fstream>
+#include <io.h>
+#include <share.h>
+#include <windows.h>
+
+// FUNCTION: fn_18255
+bool CreateDirectoryPath(std::string path) {
+  if (path.empty()) {
+    return false;
+  }
+
+  std::string::size_type separator = path.find('\\');
+  std::string::size_type end = separator;
+  std::string prefix;
+  std::string remaining(path);
+  while (prefix.size() != path.size()) {
+    prefix = path.substr(0, end);
+    remaining = remaining.substr(separator + 1);
+    separator = remaining.find('\\');
+    end = separator == std::string::npos ? path.size() : end + separator + 1;
+    if (_access(prefix.c_str(), 0) != 0 && _mkdir(prefix.c_str()) != 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+// FUNCTION: fn_18256
+std::string CreateUniqueFileName(const std::string& filename) {
+  char drive[MAX_PATH]{};
+  char directory[MAX_PATH]{};
+  char name[MAX_PATH]{};
+  char extension[MAX_PATH]{};
+  _splitpath_s(filename.c_str(), drive, sizeof(drive), directory, sizeof(directory), name, sizeof(name), extension, sizeof(extension));
+  std::string parent = FormatOwnedString("%s%s", drive, directory);
+  CreateDirectoryPath(parent);
+
+  int index = 0;
+  std::string result(filename);
+  while (_access(result.c_str(), 0) == 0) {
+    result = FormatOwnedString("%s%s%s(%d)%s", drive, directory, name, ++index, extension);
+  }
+  std::ofstream output(result.c_str(), std::ios::out, _SH_DENYNO);
+  output.close();
+  return result;
+}
diff --git a/Source/File/FileCreation.h b/Source/File/FileCreation.h
new file mode 100644
index 0000000..e71d328
--- /dev/null
+++ b/Source/File/FileCreation.h
@@ -0,0 +1,9 @@
+#ifndef RAGNAROK_SOURCE_FILE_FILECREATION_H
+#define RAGNAROK_SOURCE_FILE_FILECREATION_H
+
+#include <string>
+
+bool CreateDirectoryPath(std::string path);
+std::string CreateUniqueFileName(const std::string& filename);
+
+#endif
diff --git a/Source/Utility/Text/FormatString.cpp b/Source/Utility/Text/FormatString.cpp
index 23b32f9..00d324b 100644
--- a/Source/Utility/Text/FormatString.cpp
+++ b/Source/Utility/Text/FormatString.cpp
@@ -13,7 +13,7 @@
 int StringFormat(char* buffer, std::size_t sizeInBytes, std::size_t count, const char* format, ...) {
   va_list args;
   va_start(args, format);
-  const int result = _vsnprintf_s(buffer, sizeInBytes, count, format, args);
+  const int result = __stdio_common_vsnprintf_s(_CRT_INTERNAL_LOCAL_PRINTF_OPTIONS, buffer, sizeInBytes, count, format, nullptr, args);
   va_end(args);
 
   if (result < 0) {
@@ -72,3 +72,13 @@ const char* FormatString(const char* format, ...) {
 
   return s_buffer.GetBuffer();
 }
+
+// FUNCTION: fn_18252
+std::string FormatOwnedString(const char* format, ...) {
+  char buffer[4096];
+  va_list arguments;
+  va_start(arguments, format);
+  _vsnprintf_s(buffer, sizeof(buffer), static_cast<std::size_t>(-1), format, arguments);
+  va_end(arguments);
+  return std::string(buffer, std::strlen(buffer));
+}
diff --git a/Source/Utility/Text/FormatString.h b/Source/Utility/Text/FormatString.h
index 180e84f..c6c6b30 100644
--- a/Source/Utility/Text/FormatString.h
+++ b/Source/Utility/Text/FormatString.h
@@ -2,8 +2,10 @@
 #define RAGNAROK_SOURCE_UTILITY_TEXT_FORMATSTRING_H
 
 #include <cstddef>
+#include <string>
 
 const char* FormatString(const char* format, ...);
 int StringFormat(char* buffer, std::size_t sizeInBytes, std::size_t count, const char* format, ...);
+std::string FormatOwnedString(const char* format, ...);
 
 #endif
diff --git a/compile.json b/compile.json
index 8bdae85..f69bb01 100644
--- a/compile.json
+++ b/compile.json
@@ -388,6 +388,7 @@
   "Source/Contents/World/WorldViewSpatial.cpp": 3,
   "Source/File/CommonObject.cpp": 1,
   "Source/File/File.cpp": 1,
+  "Source/File/FileCreation.cpp": 1,
   "Source/File/FileEnumeration.cpp": 1,
   "Source/File/MapName.cpp": 1,
   "Source/File/ResourcePath.cpp": 1,