V45.38: suppress iZotope 0x7E dialog

- _is_vst2_dll: pure-Python PE export-table check (magic-aware dd offset
  PE32+112) -> IZOzone11Core.dll (runtime lib, no VSTPluginMain) dropped
  from VST2 lists in _scan_plugins and list_scan_all; plugins.py same.
- _hidden_desktop_startupinfo: scan subprocess runs on hidden desktop
  (user32 CreateDesktopW, HDESK restype) -> third-party MessageBox invisible.
- SetErrorMode(SEM_FAILCRITICALERRORS|SEM_NOOPENFILEERRORBOX) in all 4
  bridge mains: missing dependency DLL fails silently instead of blocking.

native_bridge/src/gui_probe.cpp

@@ -106,6 +106,10 @@ public:
 };
 
 int main(int argc, char* argv[]) {
+#ifdef _WIN32
+    // Suppress Windows loader error dialogs (0x7E) during probe loads.
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+#endif
     if (argc < 2) {
         printf("usage: gui_probe <plugin.vst3> [variant] [secs] [hwnd]\n"
                "variants: main_own | worker_own_nopump | worker_own_pump | worker_foreign_nopump | worker_foreign_pump | bridge_like | same_thread | two_instances | two_instances_close | close_reopen | bridge_two | shared_worker | ui_thread | two_workers_close\n");

native_bridge/src/main.cpp

@@ -715,6 +715,10 @@ int main(int argc, char* argv[]) {
     SetUnhandledExceptionFilter(CrashDumpHandler);
     AddVectoredExceptionHandler(1, VectoredCrashHandler);
 #ifdef _WIN32
+    // Suppress Windows loader error dialogs: a plugin whose dependency DLL is
+    // missing (LoadLibrary -> 0x7E) must fail silently, not pop a MessageBox
+    // that blocks the user. Child processes inherit this error mode.
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
     // Background daemon: detach the console window unless SF_KEEP_CONSOLE is
     // set. Console apps spawned from the GUI (tauri-shell, Popen) flash a
     // console window otherwise. Redirected stdio (pipe to bridge.log / the

native_bridge/src/main_fx.cpp

@@ -106,6 +106,9 @@ int main(int argc, char* argv[]) {
 #ifdef _WIN32
     SetUnhandledExceptionFilter(FxCrashDumpHandler);
     AddVectoredExceptionHandler(1, FxVectoredCrashHandler);
+    // Suppress Windows loader error dialogs (plugin dependency thiếu -> 0x7E
+    // phải fail âm thầm, không MessageBox chặn user; child kế thừa error mode).
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
     win_daemon_init();
 #endif
     // stderr, not stdout: stdout is reserved for machine-readable output in

native_bridge/src/plugin_host_main.cpp

@@ -86,6 +86,11 @@ static HWND make_host_window() {
 }
 
 int main(int argc, char* argv[]) {
+#ifdef _WIN32
+    // Suppress Windows loader error dialogs — plugin dependency thiếu (0x7E)
+    // phải fail âm thầm, không MessageBox chặn user.
+    SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+#endif
     std::string shmName, path, presetFile;
     double sr = 44100.0;
     uint32_t block = AUDIO_BLOCK_SIZE;