diff --git a/extras/Build/CMake/JUCEUtils.cmake b/extras/Build/CMake/JUCEUtils.cmake
index d86ce8a997..954a435db5 100644
--- a/extras/Build/CMake/JUCEUtils.cmake
+++ b/extras/Build/CMake/JUCEUtils.cmake
@@ -843,7 +843,7 @@ function(_juce_add_lv2_manifest_helper_target)
     set(source "${module_path}/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp")
     add_executable(juce_lv2_helper "${source}")
     add_executable(juce::juce_lv2_helper ALIAS juce_lv2_helper)
-    target_compile_features(juce_lv2_helper PRIVATE cxx_std_14)
+    target_compile_features(juce_lv2_helper PRIVATE cxx_std_17)
     set_target_properties(juce_lv2_helper PROPERTIES BUILD_WITH_INSTALL_RPATH ON)
     target_link_libraries(juce_lv2_helper PRIVATE ${CMAKE_DL_LIBS})
 endfunction()
diff --git a/modules/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp b/modules/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp
index 1e4a4bc15d..c4ca28b39c 100644
--- a/modules/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp
+++ b/modules/juce_audio_plugin_client/LV2/juce_LV2TurtleDumpProgram.cpp
@@ -25,11 +25,19 @@
 
 #include <cstdint>
 #include <cstdio>
+#include <cstring>
+#include <vector>
 
 #ifdef _WIN32
+ #undef UNICODE
+ #undef _UNICODE
+
+ #define UNICODE 1
+ #define _UNICODE 1
+
  #include <windows.h>
  #include <tchar.h>
- HMODULE dlopen (const char* filename, int) { return LoadLibrary (filename); }
+ HMODULE dlopen (const TCHAR* filename, int) { return LoadLibrary (filename); }
  FARPROC dlsym (HMODULE handle, const char* name) { return GetProcAddress (handle, name); }
  void printError()
  {
@@ -44,12 +52,61 @@
                     numElements - 1,
                     nullptr);
 
-     _tprintf ("%s", messageBuffer);
+     _tprintf (_T ("%s"), messageBuffer);
  }
+
  enum { RTLD_LAZY = 0 };
+
+ class ArgList
+ {
+ public:
+     ArgList (int, const char**) {}
+     ArgList (const ArgList&) = delete;
+     ArgList (ArgList&&) = delete;
+     ArgList& operator= (const ArgList&) = delete;
+     ArgList& operator= (ArgList&&) = delete;
+     ~ArgList() { LocalFree (argv); }
+
+     LPWSTR get (int i) const { return argv[i]; }
+
+     int size() const { return argc; }
+
+ private:
+     int argc = 0;
+     LPWSTR* argv = CommandLineToArgvW (GetCommandLineW(), &argc);
+ };
+
+ std::vector<char> toUTF8 (const TCHAR* str)
+ {
+     const auto numBytes = WideCharToMultiByte (CP_UTF8, 0, str, -1, nullptr, 0, nullptr, nullptr);
+     std::vector<char> result (numBytes);
+     WideCharToMultiByte (CP_UTF8, 0, str, -1, result.data(), static_cast<int> (result.size()), nullptr, nullptr);
+     return result;
+ }
+
 #else
  #include <dlfcn.h>
  void printError() { printf ("%s\n", dlerror()); }
+ class ArgList
+ {
+ public:
+     ArgList (int argcIn, const char** argvIn) : argc (argcIn), argv (argvIn) {}
+     ArgList (const ArgList&) = delete;
+     ArgList (ArgList&&) = delete;
+     ArgList& operator= (const ArgList&) = delete;
+     ArgList& operator= (ArgList&&) = delete;
+     ~ArgList() = default;
+
+     const char* get (int i) const { return argv[i]; }
+
+     int size() const { return argc; }
+
+ private:
+     int argc = 0;
+     const char** argv = nullptr;
+ };
+
+ std::vector<char> toUTF8 (const char* str) { return std::vector<char> (str, str + std::strlen (str) + 1); }
 #endif
 
 // Replicating part of the LV2 header here so that we don't have to set up any
@@ -74,10 +131,12 @@ extern "C"
 
 int main (int argc, const char** argv)
 {
-    if (argc != 2)
+    const ArgList argList { argc, argv };
+
+    if (argList.size() != 2)
         return 1;
 
-    const auto* libraryPath = argv[1];
+    const auto* libraryPath = argList.get (1);
 
     struct RecallFeature
     {
@@ -87,11 +146,22 @@ int main (int argc, const char** argv)
     if (auto* handle = dlopen (libraryPath, RTLD_LAZY))
     {
         if (auto* getDescriptor = reinterpret_cast<const LV2_Descriptor* (*) (uint32_t)> (dlsym (handle, "lv2_descriptor")))
+        {
             if (auto* descriptor = getDescriptor (0))
+            {
                 if (auto* extensionData = descriptor->extension_data)
+                {
                     if (auto* recallFeature = reinterpret_cast<const RecallFeature*> (extensionData ("https://lv2-extensions.juce.com/turtle_recall")))
+                    {
                         if (auto* doRecall = recallFeature->doRecall)
-                            return doRecall (libraryPath);
+                        {
+                            const auto converted = toUTF8 (libraryPath);
+                            return doRecall (converted.data());
+                        }
+                    }
+                }
+            }
+        }
     }
     else
     {
diff --git a/modules/juce_audio_plugin_client/LV2/juce_LV2_Client.cpp b/modules/juce_audio_plugin_client/LV2/juce_LV2_Client.cpp
index 778c5c6a6d..2c1619b628 100644
--- a/modules/juce_audio_plugin_client/LV2/juce_LV2_Client.cpp
+++ b/modules/juce_audio_plugin_client/LV2/juce_LV2_Client.cpp
@@ -840,15 +840,28 @@ private:
         return JucePlugin_LV2URI + String (uriSeparator) + "preset" + String (index + 1);
     }
 
-    static std::ofstream openStream (const File& libraryPath, StringRef name)
+    static FileOutputStream openStream (const File& libraryPath, StringRef name)
     {
-        return std::ofstream { libraryPath.getSiblingFile (name + ".ttl").getFullPathName().toRawUTF8() };
+        return FileOutputStream { libraryPath.getSiblingFile (name + ".ttl") };
+    }
+
+    static Result prepareStream (FileOutputStream& stream)
+    {
+        if (const auto result = stream.getStatus(); ! result)
+            return result;
+
+        stream.setPosition (0);
+        stream.truncate();
+        return Result::ok();
     }
 
     static Result writeManifestTtl (AudioProcessor& proc, const File& libraryPath)
     {
         auto os = openStream (libraryPath, "manifest");
 
+        if (const auto result = prepareStream (os); ! result)
+            return result;
+
         os << "@prefix lv2:   <http://lv2plug.in/ns/lv2core#> .\n"
               "@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .\n"
               "@prefix pset:  <http://lv2plug.in/ns/ext/presets#> .\n"
@@ -980,6 +993,9 @@ private:
     {
         auto os = openStream (libraryPath, "dsp");
 
+        if (const auto result = prepareStream (os); ! result)
+            return result;
+
         os << "@prefix atom:  <http://lv2plug.in/ns/ext/atom#> .\n"
               "@prefix bufs:  <http://lv2plug.in/ns/ext/buf-size#> .\n"
               "@prefix doap:  <http://usefulinc.com/ns/doap#> .\n"
@@ -1317,6 +1333,9 @@ private:
 
         auto os = openStream (libraryPath, "ui");
 
+        if (const auto result = prepareStream (os); ! result)
+            return result;
+
         const auto editorInstance = rawToUniquePtr (proc.createEditor());
         const auto resizeFeatureString = editorInstance->isResizable() ? "ui:resize" : "ui:noUserResize";