diff --git a/src/openrct2/CmdlineSprite.cpp b/src/openrct2/CmdlineSprite.cpp
index d3b4bf375b..ea4e9945e8 100644
--- a/src/openrct2/CmdlineSprite.cpp
+++ b/src/openrct2/CmdlineSprite.cpp
@@ -13,6 +13,7 @@
 
 #include "OpenRCT2.h"
 #include "core/Imaging.h"
+#include "core/String.hpp"
 #include "drawing/Drawing.h"
 #include "drawing/ImageImporter.h"
 #include "localisation/Language.h"
@@ -68,11 +69,9 @@ static uint8_t* spriteFileData;
 
 static FILE* fopen_utf8(const char* path, const char* mode)
 {
-    wchar_t* pathW = utf8_to_widechar(path);
-    wchar_t* modeW = utf8_to_widechar(mode);
-    FILE* file = _wfopen(pathW, modeW);
-    free(pathW);
-    free(modeW);
+    auto pathW = String::ToUtf16(path);
+    auto modeW = String::ToUtf16(mode);
+    auto file = _wfopen(pathW.c_str(), modeW.c_str());
     return file;
 }
 
@@ -640,20 +639,19 @@ int32_t cmdline_for_sprite(const char** argv, int32_t argc)
             }
 
             // Resolve absolute sprite path
-            char* imagePath = platform_get_absolute_path(json_string_value(path), directoryPath);
+            auto imagePath = platform_get_absolute_path(json_string_value(path), directoryPath);
 
             rct_g1_element spriteElement;
             uint8_t* buffer;
             int bufferLength;
 
             if (!sprite_file_import(
-                    imagePath, x_offset == nullptr ? 0 : json_integer_value(x_offset),
+                    imagePath.c_str(), x_offset == nullptr ? 0 : json_integer_value(x_offset),
                     y_offset == nullptr ? 0 : json_integer_value(y_offset), keep_palette, forceBmp, &spriteElement, &buffer,
                     &bufferLength, gSpriteMode))
             {
-                fprintf(stderr, "Could not import image file: %s\nCanceling\n", imagePath);
+                fprintf(stderr, "Could not import image file: %s\nCanceling\n", imagePath.c_str());
                 json_decref(sprite_list);
-                free(imagePath);
                 return -1;
             }
 
@@ -661,7 +659,6 @@ int32_t cmdline_for_sprite(const char** argv, int32_t argc)
             {
                 fprintf(stderr, "Unable to open sprite file: %s\nCanceling\n", spriteFilePath);
                 json_decref(sprite_list);
-                free(imagePath);
                 return -1;
             }
 
@@ -683,16 +680,14 @@ int32_t cmdline_for_sprite(const char** argv, int32_t argc)
 
             if (!sprite_file_save(spriteFilePath))
             {
-                fprintf(stderr, "Could not save sprite file: %s\nCanceling\n", imagePath);
+                fprintf(stderr, "Could not save sprite file: %s\nCanceling\n", imagePath.c_str());
                 json_decref(sprite_list);
-                free(imagePath);
                 return -1;
             }
 
             if (!silent)
-                fprintf(stdout, "Added: %s\n", imagePath);
+                fprintf(stdout, "Added: %s\n", imagePath.c_str());
 
-            free(imagePath);
             sprite_file_close();
         }
 
diff --git a/src/openrct2/config/Config.cpp b/src/openrct2/config/Config.cpp
index 556c461501..08d59488ee 100644
--- a/src/openrct2/config/Config.cpp
+++ b/src/openrct2/config/Config.cpp
@@ -362,7 +362,7 @@ namespace Config
             auto playerName = reader->GetString("player_name", "");
             if (playerName.empty())
             {
-                playerName = String::ToStd(platform_get_username());
+                playerName = platform_get_username();
                 if (playerName.empty())
                 {
                     playerName = "Player";
diff --git a/src/openrct2/core/File.cpp b/src/openrct2/core/File.cpp
index bae6d23440..df3220daf7 100644
--- a/src/openrct2/core/File.cpp
+++ b/src/openrct2/core/File.cpp
@@ -125,8 +125,8 @@ namespace File
     {
         uint64_t lastModified = 0;
 #ifdef _WIN32
-        auto pathW = utf8_to_widechar(path.c_str());
-        auto hFile = CreateFileW(pathW, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr);
+        auto pathW = String::ToUtf16(path.c_str());
+        auto hFile = CreateFileW(pathW.c_str(), GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr);
         if (hFile != INVALID_HANDLE_VALUE)
         {
             FILETIME ftCreate, ftAccess, ftWrite;
@@ -136,7 +136,6 @@ namespace File
             }
             CloseHandle(hFile);
         }
-        free(pathW);
 #else
         struct stat statInfo
         {
diff --git a/src/openrct2/core/FileScanner.cpp b/src/openrct2/core/FileScanner.cpp
index 718d97cc49..c3084124f1 100644
--- a/src/openrct2/core/FileScanner.cpp
+++ b/src/openrct2/core/FileScanner.cpp
@@ -227,11 +227,11 @@ public:
 
     void GetDirectoryChildren(std::vector<DirectoryChild>& children, const std::string& path) override
     {
-        std::string pattern = path + "\\*";
-        wchar_t* wPattern = utf8_to_widechar(pattern.c_str());
+        auto pattern = path + "\\*";
+        auto wPattern = String::ToUtf16(pattern.c_str());
 
         WIN32_FIND_DATAW findData;
-        HANDLE hFile = FindFirstFileW(wPattern, &findData);
+        HANDLE hFile = FindFirstFileW(wPattern.c_str(), &findData);
         if (hFile != INVALID_HANDLE_VALUE)
         {
             do
@@ -244,8 +244,6 @@ public:
             } while (FindNextFileW(hFile, &findData));
             FindClose(hFile);
         }
-
-        Memory::Free(wPattern);
     }
 
 private:
@@ -253,10 +251,7 @@ private:
     {
         DirectoryChild result;
 
-        utf8* name = widechar_to_utf8(child->cFileName);
-        result.Name = std::string(name);
-        Memory::Free(name);
-
+        result.Name = String::ToUtf8(child->cFileName);
         if (child->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
         {
             result.Type = DIRECTORY_CHILD_TYPE::DC_DIRECTORY;
diff --git a/src/openrct2/core/FileStream.hpp b/src/openrct2/core/FileStream.hpp
index 0839b9994f..dc4b5e1b83 100644
--- a/src/openrct2/core/FileStream.hpp
+++ b/src/openrct2/core/FileStream.hpp
@@ -70,11 +70,9 @@ public:
         }
 
 #ifdef _WIN32
-        wchar_t* pathW = utf8_to_widechar(path);
-        wchar_t* modeW = utf8_to_widechar(mode);
-        _file = _wfopen(pathW, modeW);
-        free(pathW);
-        free(modeW);
+        auto pathW = String::ToUtf16(path);
+        auto modeW = String::ToUtf16(mode);
+        _file = _wfopen(pathW.c_str(), modeW.c_str());
 #else
         if (fileMode == FILE_MODE_OPEN)
         {
diff --git a/src/openrct2/core/Path.cpp b/src/openrct2/core/Path.cpp
index 35064173d0..8dfaf7f3e2 100644
--- a/src/openrct2/core/Path.cpp
+++ b/src/openrct2/core/Path.cpp
@@ -171,19 +171,17 @@ namespace Path
     utf8* GetAbsolute(utf8* buffer, size_t bufferSize, const utf8* relativePath)
     {
 #ifdef _WIN32
-        wchar_t* relativePathW = utf8_to_widechar(relativePath);
+        auto relativePathW = String::ToUtf16(relativePath);
         wchar_t absolutePathW[MAX_PATH];
-        DWORD length = GetFullPathNameW(relativePathW, (DWORD)std::size(absolutePathW), absolutePathW, nullptr);
-        Memory::Free(relativePathW);
+        DWORD length = GetFullPathNameW(relativePathW.c_str(), (DWORD)std::size(absolutePathW), absolutePathW, nullptr);
         if (length == 0)
         {
             return String::Set(buffer, bufferSize, relativePath);
         }
         else
         {
-            utf8* absolutePath = widechar_to_utf8(absolutePathW);
-            String::Set(buffer, bufferSize, absolutePath);
-            Memory::Free(absolutePath);
+            auto absolutePath = String::ToUtf8(absolutePathW);
+            String::Set(buffer, bufferSize, absolutePath.c_str());
             return buffer;
         }
 #else
diff --git a/src/openrct2/localisation/Language.h b/src/openrct2/localisation/Language.h
index 17d0340456..d19b0e5eab 100644
--- a/src/openrct2/localisation/Language.h
+++ b/src/openrct2/localisation/Language.h
@@ -101,8 +101,6 @@ bool utf8_is_codepoint_start(const utf8* text);
 void utf8_remove_format_codes(utf8* text, bool allowcolours);
 int32_t utf8_get_codepoint_length(int32_t codepoint);
 int32_t utf8_length(const utf8* text);
-wchar_t* utf8_to_widechar(const utf8* src);
-utf8* widechar_to_utf8(const wchar_t* src);
 
 std::string rct2_to_utf8(const std::string_view& src, RCT2LanguageId languageId);
 std::string utf8_to_rct2(const std::string_view& src);
diff --git a/src/openrct2/localisation/UTF8.cpp b/src/openrct2/localisation/UTF8.cpp
index 708e8df85d..b91c929d18 100644
--- a/src/openrct2/localisation/UTF8.cpp
+++ b/src/openrct2/localisation/UTF8.cpp
@@ -137,44 +137,6 @@ int32_t utf8_length(const utf8* text)
     return count;
 }
 
-wchar_t* utf8_to_widechar(const utf8* src)
-{
-    wchar_t* result = (wchar_t*)malloc((utf8_length(src) + 1) * sizeof(wchar_t));
-    wchar_t* dst = result;
-
-    const utf8* ch = src;
-    int32_t codepoint;
-    while ((codepoint = utf8_get_next(ch, &ch)) != 0)
-    {
-        if ((uint32_t)codepoint > 0xFFFF)
-        {
-            *dst++ = '?';
-        }
-        else
-        {
-            *dst++ = codepoint;
-        }
-    }
-    *dst = 0;
-
-    return result;
-}
-
-utf8* widechar_to_utf8(const wchar_t* src)
-{
-    utf8* result = (utf8*)malloc((wcslen(src) * 4) + 1);
-    utf8* dst = result;
-
-    for (; *src != 0; src++)
-    {
-        dst = utf8_write_codepoint(dst, *src);
-    }
-    *dst++ = 0;
-
-    size_t size = (size_t)(dst - result);
-    return (utf8*)realloc(result, size);
-}
-
 /**
  * Returns a pointer to the null terminator of the given UTF-8 string.
  */
diff --git a/src/openrct2/network/Network.cpp b/src/openrct2/network/Network.cpp
index 80e2d32d51..a4ecd1d205 100644
--- a/src/openrct2/network/Network.cpp
+++ b/src/openrct2/network/Network.cpp
@@ -1356,8 +1356,8 @@ void Network::BeginChatLog()
     _chatLogPath = BeginLog(directory, "", _chatLogFilenameFormat);
 
 #    if defined(_WIN32) && !defined(__MINGW32__)
-    auto pathW = std::unique_ptr<wchar_t>(utf8_to_widechar(_chatLogPath.c_str()));
-    _chat_log_fs.open(pathW.get(), std::ios::out | std::ios::app);
+    auto pathW = String::ToUtf16(_chatLogPath.c_str());
+    _chat_log_fs.open(pathW.c_str(), std::ios::out | std::ios::app);
 #    else
     _chat_log_fs.open(_chatLogPath, std::ios::out | std::ios::app);
 #    endif
@@ -1382,8 +1382,8 @@ void Network::BeginServerLog()
     _serverLogPath = BeginLog(directory, ServerName, _serverLogFilenameFormat);
 
 #    if defined(_WIN32) && !defined(__MINGW32__)
-    auto pathW = std::unique_ptr<wchar_t>(utf8_to_widechar(_serverLogPath.c_str()));
-    _server_log_fs.open(pathW.get(), std::ios::out | std::ios::app | std::ios::binary);
+    auto pathW = String::ToUtf16(_serverLogPath.c_str());
+    _server_log_fs.open(pathW.c_str(), std::ios::out | std::ios::app | std::ios::binary);
 #    else
     _server_log_fs.open(_serverLogPath, std::ios::out | std::ios::app | std::ios::binary);
 #    endif
diff --git a/src/openrct2/platform/Crash.cpp b/src/openrct2/platform/Crash.cpp
index 45b0dd0525..6d6fc6bf7c 100644
--- a/src/openrct2/platform/Crash.cpp
+++ b/src/openrct2/platform/Crash.cpp
@@ -150,18 +150,17 @@ static bool OnCrash(
     wprintf(L"Commit: %s\n", _wszCommitSha1Short);
 
     bool savedGameDumped = false;
-    utf8* saveFilePathUTF8 = widechar_to_utf8(saveFilePath);
+    auto saveFilePathUTF8 = String::ToUtf8(saveFilePath);
     try
     {
         auto exporter = std::make_unique<S6Exporter>();
         exporter->Export();
-        exporter->SaveGame(saveFilePathUTF8);
+        exporter->SaveGame(saveFilePathUTF8.c_str());
         savedGameDumped = true;
     }
     catch (const std::exception&)
     {
     }
-    free(saveFilePathUTF8);
 
     // Compress the save
     if (savedGameDumped)
@@ -181,19 +180,16 @@ static bool OnCrash(
         fclose(dest);
     }
 
-    utf8* configFilePathUTF8 = widechar_to_utf8(configFilePath);
-    if (config_save(configFilePathUTF8))
+    auto configFilePathUTF8 = String::ToUtf8(configFilePath);
+    if (config_save(configFilePathUTF8.c_str()))
     {
         uploadFiles[L"attachment_config.ini"] = configFilePath;
     }
-    free(configFilePathUTF8);
 
     std::string screenshotPath = screenshot_dump();
     if (!screenshotPath.empty())
     {
-        wchar_t* screenshotPathWchar = utf8_to_widechar(screenshotPath.c_str());
-        auto screenshotPathW = std::wstring(screenshotPathWchar);
-        free(screenshotPathWchar);
+        auto screenshotPathW = String::ToUtf16(screenshotPath.c_str());
         uploadFiles[L"attachment_screenshot.png"] = screenshotPathW;
     }
 
@@ -270,11 +266,7 @@ static std::wstring GetDumpDirectory()
 {
     char userDirectory[MAX_PATH];
     platform_get_user_directory(userDirectory, nullptr, sizeof(userDirectory));
-
-    wchar_t* userDirectoryW = utf8_to_widechar(userDirectory);
-    auto result = std::wstring(userDirectoryW);
-    free(userDirectoryW);
-
+    auto result = String::ToUtf16(userDirectory);
     return result;
 }
 
diff --git a/src/openrct2/platform/Posix.cpp b/src/openrct2/platform/Posix.cpp
index 733df1b6fc..e31aa4fc0a 100644
--- a/src/openrct2/platform/Posix.cpp
+++ b/src/openrct2/platform/Posix.cpp
@@ -21,6 +21,7 @@
 #    include "../OpenRCT2.h"
 #    include "../config/Config.h"
 #    include "../core/Path.hpp"
+#    include "../core/String.hpp"
 #    include "../localisation/Date.h"
 #    include "../localisation/Language.h"
 #    include "../util/Util.h"
@@ -97,20 +98,19 @@ void platform_get_time_local(rct2_time* out_time)
 
 static size_t platform_utf8_to_multibyte(const utf8* path, char* buffer, size_t buffer_size)
 {
-    wchar_t* wpath = utf8_to_widechar(path);
+    auto wpath = String::ToUtf16(path);
     setlocale(LC_CTYPE, "UTF-8");
-    size_t len = wcstombs(NULL, wpath, 0);
+    size_t len = wcstombs(NULL, wpath.c_str(), 0);
     bool truncated = false;
     if (len > buffer_size - 1)
     {
         truncated = true;
         len = buffer_size - 1;
     }
-    wcstombs(buffer, wpath, len);
+    wcstombs(buffer, wpath.c_str(), len);
     buffer[len] = '\0';
     if (truncated)
         log_warning("truncated string %s", buffer);
-    free(wpath);
     return len;
 }
 
@@ -286,19 +286,29 @@ bool platform_directory_delete(const utf8* path)
     return true;
 }
 
-utf8* platform_get_absolute_path(const utf8* relative_path, const utf8* base_path)
+std::string platform_get_absolute_path(const utf8* relative_path, const utf8* base_path)
 {
-    utf8 path[MAX_PATH];
+    std::string result;
+    if (relative_path != nullptr)
+    {
+        std::string pathToResolve;
+        if (base_path == nullptr)
+        {
+            pathToResolve = std::string(relative_path);
+        }
+        else
+        {
+            pathToResolve = std::string(base_path) + std::string("/") + relative_path;
+        }
 
-    if (base_path != nullptr)
-    {
-        snprintf(path, MAX_PATH, "%s/%s", base_path, relative_path);
+        auto realpathResult = realpath(pathToResolve.c_str(), nullptr);
+        if (realpathResult != nullptr)
+        {
+            result = std::string(realpathResult);
+            free(realpathResult);
+        }
     }
-    else
-    {
-        safe_strcpy(path, base_path, MAX_PATH);
-    }
-    return realpath(path, NULL);
+    return result;
 }
 
 bool platform_lock_single_instance()
@@ -482,18 +492,15 @@ datetime64 platform_get_datetime_now_utc()
     return utcNow;
 }
 
-utf8* platform_get_username()
+std::string platform_get_username()
 {
-    struct passwd* pw = getpwuid(getuid());
-
-    if (pw)
+    std::string result;
+    auto pw = getpwuid(getuid());
+    if (pw != nullptr)
     {
-        return pw->pw_name;
-    }
-    else
-    {
-        return nullptr;
+        result = std::string(pw->pw_name);
     }
+    return result;
 }
 
 bool platform_process_is_elevated()
diff --git a/src/openrct2/platform/Windows.cpp b/src/openrct2/platform/Windows.cpp
index 78535d3bcf..3e11ec3ce1 100644
--- a/src/openrct2/platform/Windows.cpp
+++ b/src/openrct2/platform/Windows.cpp
@@ -85,18 +85,16 @@ void platform_get_time_local(rct2_time* out_time)
 
 bool platform_file_exists(const utf8* path)
 {
-    wchar_t* wPath = utf8_to_widechar(path);
-    DWORD result = GetFileAttributesW(wPath);
+    auto wPath = String::ToUtf16(path);
+    DWORD result = GetFileAttributesW(wPath.c_str());
     DWORD error = GetLastError();
-    free(wPath);
     return !(result == INVALID_FILE_ATTRIBUTES && (error == ERROR_FILE_NOT_FOUND || error == ERROR_PATH_NOT_FOUND));
 }
 
 bool platform_directory_exists(const utf8* path)
 {
-    wchar_t* wPath = utf8_to_widechar(path);
-    DWORD dwAttrib = GetFileAttributesW(wPath);
-    free(wPath);
+    auto wPath = String::ToUtf16(path);
+    DWORD dwAttrib = GetFileAttributesW(wPath.c_str());
     return dwAttrib != INVALID_FILE_ATTRIBUTES && (dwAttrib & FILE_ATTRIBUTE_DIRECTORY);
 }
 
@@ -127,27 +125,20 @@ bool platform_ensure_directory_exists(const utf8* path)
     if (platform_directory_exists(path))
         return 1;
 
-    wchar_t* wPath = utf8_to_widechar(path);
-    BOOL success = CreateDirectoryW(wPath, nullptr);
-    free(wPath);
-    return success == TRUE;
+    auto wPath = String::ToUtf16(path);
+    auto success = CreateDirectoryW(wPath.c_str(), nullptr);
+    return success != FALSE;
 }
 
 bool platform_directory_delete(const utf8* path)
 {
-    wchar_t pszFrom[MAX_PATH];
-
-    wchar_t* wPath = utf8_to_widechar(path);
-    wcsncpy(pszFrom, wPath, MAX_PATH);
-
-    // Needs to be double-null terminated for some weird reason
-    pszFrom[wcslen(wPath) + 1] = 0;
-    free(wPath);
+    // Needs to be double-null terminated as pFrom is a null terminated array of strings
+    auto wPath = String::ToUtf16(path) + L"\0";
 
     SHFILEOPSTRUCTW fileop;
     fileop.hwnd = nullptr;                           // no status display
     fileop.wFunc = FO_DELETE;                        // delete operation
-    fileop.pFrom = pszFrom;                          // source file name as double null terminated string
+    fileop.pFrom = wPath.c_str();                    // source file name as double null terminated string
     fileop.pTo = nullptr;                            // no destination needed
     fileop.fFlags = FOF_NOCONFIRMATION | FOF_SILENT; // do not prompt the user
 
@@ -189,30 +180,25 @@ int32_t platform_get_drives()
 
 bool platform_file_copy(const utf8* srcPath, const utf8* dstPath, bool overwrite)
 {
-    wchar_t* wSrcPath = utf8_to_widechar(srcPath);
-    wchar_t* wDstPath = utf8_to_widechar(dstPath);
-    BOOL success = CopyFileW(wSrcPath, wDstPath, overwrite ? FALSE : TRUE);
-    free(wSrcPath);
-    free(wDstPath);
-    return success == TRUE;
+    auto wSrcPath = String::ToUtf16(srcPath);
+    auto wDstPath = String::ToUtf16(dstPath);
+    auto success = CopyFileW(wSrcPath.c_str(), wDstPath.c_str(), overwrite ? FALSE : TRUE);
+    return success != FALSE;
 }
 
 bool platform_file_move(const utf8* srcPath, const utf8* dstPath)
 {
-    wchar_t* wSrcPath = utf8_to_widechar(srcPath);
-    wchar_t* wDstPath = utf8_to_widechar(dstPath);
-    BOOL success = MoveFileW(wSrcPath, wDstPath);
-    free(wSrcPath);
-    free(wDstPath);
-    return success == TRUE;
+    auto wSrcPath = String::ToUtf16(srcPath);
+    auto wDstPath = String::ToUtf16(dstPath);
+    auto success = MoveFileW(wSrcPath.c_str(), wDstPath.c_str());
+    return success != FALSE;
 }
 
 bool platform_file_delete(const utf8* path)
 {
-    wchar_t* wPath = utf8_to_widechar(path);
-    BOOL success = DeleteFileW(wPath);
-    free(wPath);
-    return success == TRUE;
+    auto wPath = String::ToUtf16(path);
+    auto success = DeleteFileW(wPath.c_str());
+    return success != FALSE;
 }
 
 bool platform_get_steam_path(utf8* outPath, size_t outSize)
@@ -236,10 +222,9 @@ bool platform_get_steam_path(utf8* outPath, size_t outSize)
     result = RegQueryValueExW(hKey, L"SteamPath", nullptr, &type, (LPBYTE)wSteamPath, &size);
     if (result == ERROR_SUCCESS)
     {
-        utf8* utf8SteamPath = widechar_to_utf8(wSteamPath);
-        safe_strcpy(outPath, utf8SteamPath, outSize);
+        auto utf8SteamPath = String::ToUtf8(wSteamPath);
+        safe_strcpy(outPath, utf8SteamPath.c_str(), outSize);
         safe_strcat_path(outPath, "steamapps\\common", outSize);
-        free(utf8SteamPath);
     }
     free(wSteamPath);
     RegCloseKey(hKey);
@@ -340,24 +325,22 @@ uint16_t platform_get_locale_language()
 
 time_t platform_file_get_modified_time(const utf8* path)
 {
-    WIN32_FILE_ATTRIBUTE_DATA data;
-
-    wchar_t* wPath = utf8_to_widechar(path);
-    BOOL result = GetFileAttributesExW(wPath, GetFileExInfoStandard, &data);
-    free(wPath);
-
-    if (!result)
-        return 0;
-
-    FILETIME localFileTime;
-    result = FileTimeToLocalFileTime(&data.ftLastWriteTime, &localFileTime);
-    if (!result)
-        return 0;
-
-    ULARGE_INTEGER ull;
-    ull.LowPart = localFileTime.dwLowDateTime;
-    ull.HighPart = localFileTime.dwHighDateTime;
-    return ull.QuadPart / 10000000ULL - 11644473600ULL;
+    WIN32_FILE_ATTRIBUTE_DATA data{};
+    auto wPath = String::ToUtf16(path);
+    auto result = GetFileAttributesExW(wPath.c_str(), GetFileExInfoStandard, &data);
+    if (result != FALSE)
+    {
+        FILETIME localFileTime{};
+        result = FileTimeToLocalFileTime(&data.ftLastWriteTime, &localFileTime);
+        if (result != FALSE)
+        {
+            ULARGE_INTEGER ull{};
+            ull.LowPart = localFileTime.dwLowDateTime;
+            ull.HighPart = localFileTime.dwHighDateTime;
+            return ull.QuadPart / 10000000ULL - 11644473600ULL;
+        }
+    }
+    return 0;
 }
 
 uint8_t platform_get_locale_currency()
@@ -468,9 +451,8 @@ bool platform_get_font_path(TTFFontDescriptor* font, utf8* buffer, size_t size)
     if (SUCCEEDED(SHGetKnownFolderPath(FOLDERID_Fonts, 0, nullptr, &fontFolder)))
     {
         // Convert wchar to utf8, then copy the font folder path to the buffer.
-        utf8* outPathTemp = widechar_to_utf8(fontFolder);
-        safe_strcpy(buffer, outPathTemp, size);
-        free(outPathTemp);
+        auto outPathTemp = String::ToUtf8(fontFolder);
+        safe_strcpy(buffer, outPathTemp.c_str(), size);
 
         CoTaskMemFree(fontFolder);
 
@@ -491,24 +473,30 @@ bool platform_get_font_path(TTFFontDescriptor* font, utf8* buffer, size_t size)
 }
 #    endif // NO_TTF
 
-utf8* platform_get_absolute_path(const utf8* relativePath, const utf8* basePath)
+std::string platform_get_absolute_path(const utf8* relativePath, const utf8* basePath)
 {
-    utf8 path[MAX_PATH];
-    safe_strcpy(path, basePath, sizeof(path));
-    safe_strcat_path(path, relativePath, sizeof(path));
-
-    wchar_t* pathW = utf8_to_widechar(path);
-    wchar_t fullPathW[MAX_PATH];
-    DWORD fullPathLen = GetFullPathNameW(pathW, (DWORD)std::size(fullPathW), fullPathW, nullptr);
-
-    free(pathW);
-
-    if (fullPathLen == 0)
+    std::string result;
+    if (relativePath != nullptr)
     {
-        return nullptr;
-    }
+        std::string pathToResolve;
+        if (basePath == nullptr)
+        {
+            pathToResolve = std::string(relativePath);
+        }
+        else
+        {
+            pathToResolve = std::string(basePath) + std::string("\\") + relativePath;
+        }
 
-    return widechar_to_utf8(fullPathW);
+        auto pathToResolveW = String::ToUtf16(pathToResolve);
+        wchar_t fullPathW[MAX_PATH]{};
+        auto fullPathLen = GetFullPathNameW(pathToResolveW.c_str(), (DWORD)std::size(fullPathW), fullPathW, nullptr);
+        if (fullPathLen != 0)
+        {
+            result = String::ToUtf8(fullPathW);
+        }
+    }
+    return result;
 }
 
 datetime64 platform_get_datetime_now_utc()
@@ -524,18 +512,16 @@ datetime64 platform_get_datetime_now_utc()
     return utcNow;
 }
 
-utf8* platform_get_username()
+std::string platform_get_username()
 {
-    static wchar_t usernameW[UNLEN + 1];
+    std::string result;
+    wchar_t usernameW[UNLEN + 1]{};
     DWORD usernameLength = UNLEN + 1;
-    if (!GetUserNameW(usernameW, &usernameLength))
+    if (GetUserNameW(usernameW, &usernameLength))
     {
-        return nullptr;
+        result = String::ToUtf8(usernameW);
     }
-
-    static std::string username;
-    username = widechar_to_utf8(usernameW);
-    return username.data();
+    return result;
 }
 
 bool platform_process_is_elevated()
@@ -565,15 +551,11 @@ bool platform_process_is_elevated()
 #    define SOFTWARE_CLASSES L"Software\\Classes"
 #    define MUI_CACHE L"Local Settings\\Software\\Microsoft\\Windows\\Shell\\MuiCache"
 
-static void get_progIdName(wchar_t* dst, const utf8* extension)
+static std::wstring get_progIdName(const std::string_view& extension)
 {
-    utf8 progIdName[128];
-    safe_strcpy(progIdName, OPENRCT2_NAME, sizeof(progIdName));
-    safe_strcat(progIdName, extension, sizeof(progIdName));
-
-    wchar_t* progIdNameW = utf8_to_widechar(progIdName);
-    lstrcpyW(dst, progIdNameW);
-    free(progIdNameW);
+    auto progIdName = std::string(OPENRCT2_NAME) + std::string(extension);
+    auto progIdNameW = String::ToUtf16(progIdName);
+    return progIdNameW;
 }
 
 static bool windows_setup_file_association(
@@ -587,13 +569,11 @@ static bool windows_setup_file_association(
     GetModuleFileNameW(nullptr, exePathW, (DWORD)std::size(exePathW));
     GetModuleFileNameW(plaform_get_dll_module(), dllPathW, (DWORD)std::size(dllPathW));
 
-    wchar_t* extensionW = utf8_to_widechar(extension);
-    wchar_t* fileTypeTextW = utf8_to_widechar(fileTypeText);
-    wchar_t* commandTextW = utf8_to_widechar(commandText);
-    wchar_t* commandArgsW = utf8_to_widechar(commandArgs);
-
-    wchar_t progIdNameW[128];
-    get_progIdName(progIdNameW, extension);
+    auto extensionW = String::ToUtf16(extension);
+    auto fileTypeTextW = String::ToUtf16(fileTypeText);
+    auto commandTextW = String::ToUtf16(commandText);
+    auto commandArgsW = String::ToUtf16(commandArgs);
+    auto progIdNameW = get_progIdName(extension);
 
     bool result = false;
     HKEY hKey = nullptr;
@@ -606,18 +586,18 @@ static bool windows_setup_file_association(
     }
 
     // [hRootKey\.ext]
-    if (RegSetValueW(hRootKey, extensionW, REG_SZ, progIdNameW, 0) != ERROR_SUCCESS)
+    if (RegSetValueW(hRootKey, extensionW.c_str(), REG_SZ, progIdNameW.c_str(), 0) != ERROR_SUCCESS)
     {
         goto fail;
     }
 
-    if (RegCreateKeyW(hRootKey, progIdNameW, &hKey) != ERROR_SUCCESS)
+    if (RegCreateKeyW(hRootKey, progIdNameW.c_str(), &hKey) != ERROR_SUCCESS)
     {
         goto fail;
     }
 
     // [hRootKey\OpenRCT2.ext]
-    if (RegSetValueW(hKey, nullptr, REG_SZ, fileTypeTextW, 0) != ERROR_SUCCESS)
+    if (RegSetValueW(hKey, nullptr, REG_SZ, fileTypeTextW.c_str(), 0) != ERROR_SUCCESS)
     {
         goto fail;
     }
@@ -637,14 +617,14 @@ static bool windows_setup_file_association(
     }
 
     // [hRootKey\OpenRCT2.sv6\shell\open]
-    if (RegSetValueW(hKey, L"shell\\open", REG_SZ, commandTextW, 0) != ERROR_SUCCESS)
+    if (RegSetValueW(hKey, L"shell\\open", REG_SZ, commandTextW.c_str(), 0) != ERROR_SUCCESS)
     {
         goto fail;
     }
 
     // [hRootKey\OpenRCT2.sv6\shell\open\command]
     wchar_t szCommandW[MAX_PATH];
-    printResult = swprintf_s(szCommandW, MAX_PATH, L"\"%s\" %s", exePathW, commandArgsW);
+    printResult = swprintf_s(szCommandW, MAX_PATH, L"\"%s\" %s", exePathW, commandArgsW.c_str());
     assert(printResult >= 0);
     if (RegSetValueW(hKey, L"shell\\open\\command", REG_SZ, szCommandW, 0) != ERROR_SUCCESS)
     {
@@ -653,10 +633,6 @@ static bool windows_setup_file_association(
 
     result = true;
 fail:
-    free(extensionW);
-    free(fileTypeTextW);
-    free(commandTextW);
-    free(commandArgsW);
     RegCloseKey(hKey);
     RegCloseKey(hRootKey);
     return result;
@@ -672,9 +648,8 @@ static void windows_remove_file_association(const utf8* extension)
         RegDeleteTreeA(hRootKey, extension);
 
         // [hRootKey\OpenRCT2.ext]
-        wchar_t progIdName[128];
-        get_progIdName(progIdName, extension);
-        RegDeleteTreeW(hRootKey, progIdName);
+        auto progIdName = get_progIdName(extension);
+        RegDeleteTreeW(hRootKey, progIdName.c_str());
 
         RegCloseKey(hRootKey);
     }
diff --git a/src/openrct2/platform/platform.h b/src/openrct2/platform/platform.h
index bad0ad63eb..5a43d04b73 100644
--- a/src/openrct2/platform/platform.h
+++ b/src/openrct2/platform/platform.h
@@ -99,7 +99,7 @@ bool platform_original_rct1_data_exists(const utf8* path);
 time_t platform_file_get_modified_time(const utf8* path);
 bool platform_ensure_directory_exists(const utf8* path);
 bool platform_directory_delete(const utf8* path);
-utf8* platform_get_absolute_path(const utf8* relative_path, const utf8* base_path);
+std::string platform_get_absolute_path(const utf8* relative_path, const utf8* base_path);
 bool platform_lock_single_instance();
 bool platform_place_string_on_clipboard(utf8* target);
 
@@ -113,7 +113,7 @@ uint32_t platform_get_ticks();
 void platform_sleep(uint32_t ms);
 void platform_get_openrct_data_path(utf8* outPath, size_t outSize);
 void platform_get_user_directory(utf8* outPath, const utf8* subDirectory, size_t outSize);
-utf8* platform_get_username();
+std::string platform_get_username();
 bool platform_open_common_file_dialog(utf8* outFilename, file_dialog_desc* desc, size_t outSize);
 utf8* platform_open_directory_browser(const utf8* title);
 uint8_t platform_get_locale_currency();