diff --git a/.github/actions/spell-check/patterns.txt b/.github/actions/spell-check/patterns.txt
index 5959fbe8fc..e79179449e 100644
--- a/.github/actions/spell-check/patterns.txt
+++ b/.github/actions/spell-check/patterns.txt
@@ -181,5 +181,8 @@ http://tes/
 # Autogenerated revert commit message
 ^This reverts commit [0-9a-f]{40}\.$
 
+# Compile flag added to Cpp.Build.props
+_SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING
+
 # ignore long runs of a single character:
 \b([A-Za-z])\g{-1}{3,}\b
diff --git a/Cpp.Build.props b/Cpp.Build.props
index 5eb275a507..3279750b33 100644
--- a/Cpp.Build.props
+++ b/Cpp.Build.props
@@ -50,7 +50,7 @@
     <ClCompile>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
       <WarningLevel>Level4</WarningLevel>
-      <DisableSpecificWarnings>4679;%(DisableSpecificWarnings)</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4679;5271;%(DisableSpecificWarnings)</DisableSpecificWarnings>
       <DisableAnalyzeExternal >true</DisableAnalyzeExternal>
       <ExternalWarningLevel>TurnOffAllWarnings</ExternalWarningLevel>
       <ConformanceMode>false</ConformanceMode>
@@ -58,7 +58,8 @@
       <LanguageStandard>stdcpplatest</LanguageStandard>
       <BuildStlModules>false</BuildStlModules>
       <AdditionalOptions>/await %(AdditionalOptions)</AdditionalOptions>
-      <PreprocessorDefinitions>_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <!-- TODO: _SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING for compatibility with VS 17.8. Check if we can remove. -->
+      <PreprocessorDefinitions>_SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <!-- CLR + CFG are not compatible >:{ -->
       <ControlFlowGuard Condition="'$(CLRSupport)' == ''">Guard</ControlFlowGuard>
       <DebugInformationFormat Condition="'%(ControlFlowGuard)' == 'Guard'">ProgramDatabase</DebugInformationFormat>
diff --git a/src/common/interop/two_way_pipe_message_ipc.cpp b/src/common/interop/two_way_pipe_message_ipc.cpp
index 7dd1dedf36..4b09e67626 100644
--- a/src/common/interop/two_way_pipe_message_ipc.cpp
+++ b/src/common/interop/two_way_pipe_message_ipc.cpp
@@ -176,7 +176,7 @@ BOOL TwoWayPipeMessageIPC::TwoWayPipeMessageIPCImpl::GetLogonSID(HANDLE hToken,
     if (!GetTokenInformation(
             hToken, // handle to the access token
             TokenGroups, // get information about the token's groups
-            (LPVOID)ptg, // pointer to TOKEN_GROUPS buffer
+            static_cast<LPVOID>(ptg), // pointer to TOKEN_GROUPS buffer
             0, // size of buffer
             &dwLength // receives required buffer size
             ))
@@ -197,7 +197,7 @@ BOOL TwoWayPipeMessageIPC::TwoWayPipeMessageIPCImpl::GetLogonSID(HANDLE hToken,
     if (!GetTokenInformation(
             hToken, // handle to the access token
             TokenGroups, // get information about the token's groups
-            (LPVOID)ptg, // pointer to TOKEN_GROUPS buffer
+            static_cast<LPVOID>(ptg), // pointer to TOKEN_GROUPS buffer
             dwLength, // size of buffer
             &dwLength // receives required buffer size
             ))
diff --git a/src/modules/Hosts/HostsModuleInterface/dllmain.cpp b/src/modules/Hosts/HostsModuleInterface/dllmain.cpp
index e971bc3f77..e089c06975 100644
--- a/src/modules/Hosts/HostsModuleInterface/dllmain.cpp
+++ b/src/modules/Hosts/HostsModuleInterface/dllmain.cpp
@@ -49,7 +49,7 @@ private:
     //contains the non localized key of the powertoy
     std::wstring app_key;
 
-    HANDLE m_hProcess;
+    HANDLE m_hProcess = nullptr;
 
     HANDLE m_hShowEvent;
 
diff --git a/src/modules/MouseWithoutBorders/ModuleInterface/dllmain.cpp b/src/modules/MouseWithoutBorders/ModuleInterface/dllmain.cpp
index ad8dc5eaed..0b259c71f8 100644
--- a/src/modules/MouseWithoutBorders/ModuleInterface/dllmain.cpp
+++ b/src/modules/MouseWithoutBorders/ModuleInterface/dllmain.cpp
@@ -123,9 +123,7 @@ class MouseWithoutBorders : public PowertoyModuleIface
 private:
     bool m_enabled = false;
     bool run_in_service_mode = false;
-    HANDLE send_telemetry_event;
-    HANDLE m_hInvokeEvent;
-    PROCESS_INFORMATION p_info;
+    PROCESS_INFORMATION p_info = {};
 
     bool is_enabled_by_default() const override
     {
@@ -520,8 +518,6 @@ public:
     virtual void enable()
     {
         Trace::MouseWithoutBorders::Enable(true);
-        ResetEvent(send_telemetry_event);
-        ResetEvent(m_hInvokeEvent);
 
         launch_process();
 
@@ -534,8 +530,6 @@ public:
         {
             Trace::MouseWithoutBorders::Enable(false);
             Logger::trace(L"Disabling MouseWithoutBorders...");
-            ResetEvent(send_telemetry_event);
-            ResetEvent(m_hInvokeEvent);
 
             Logger::trace(L"Signaled exit event for PowerToys MouseWithoutBorders.");
             TerminateProcess(p_info.hProcess, 1);
diff --git a/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.cpp b/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.cpp
index a589da85e4..bbb660a6ea 100644
--- a/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.cpp
+++ b/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.cpp
@@ -705,7 +705,7 @@ void D2DOverlayWindow::render(ID2D1DeviceContext5* d2d_device_context)
                 {
                     continue;
                 }
-                render_arrow(arrows[(size_t)(button.keynum) - 1], button, window_rect, use_overlay->get_scale(), d2d_device_context, taskbar_icon_shortcuts_x_offset, taskbar_icon_shortcuts_y_offset);
+                render_arrow(arrows[static_cast<size_t>(button.keynum) - 1], button, window_rect, use_overlay->get_scale(), d2d_device_context, taskbar_icon_shortcuts_x_offset, taskbar_icon_shortcuts_y_offset);
             }
         }
     }
diff --git a/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.h b/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.h
index 440bae0021..00f05db565 100644
--- a/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.h
+++ b/src/modules/ShortcutGuide/ShortcutGuide/overlay_window.h
@@ -93,7 +93,7 @@ private:
     std::mutex tasklist_cv_mutex;
     std::condition_variable tasklist_cv;
 
-    HTHUMBNAIL thumbnail;
+    HTHUMBNAIL thumbnail = nullptr;
     HWND active_window = nullptr;
     bool active_window_snappable = false;
     D2DOverlaySVG landscape, portrait;
diff --git a/src/modules/awake/AwakeModuleInterface/dllmain.cpp b/src/modules/awake/AwakeModuleInterface/dllmain.cpp
index 027eb9913c..cf753533dd 100644
--- a/src/modules/awake/AwakeModuleInterface/dllmain.cpp
+++ b/src/modules/awake/AwakeModuleInterface/dllmain.cpp
@@ -44,9 +44,7 @@ class Awake : public PowertoyModuleIface
 
 private:
     bool m_enabled = false;
-    HANDLE send_telemetry_event;
-    HANDLE m_hInvokeEvent;
-    PROCESS_INFORMATION p_info;
+    PROCESS_INFORMATION p_info = {};
 
     bool is_process_running()
     {
@@ -137,8 +135,6 @@ public:
     virtual void enable()
     {
         Trace::EnableAwake(true);
-        ResetEvent(send_telemetry_event);
-        ResetEvent(m_hInvokeEvent);
         launch_process();
         m_enabled = true;
     };
@@ -149,8 +145,6 @@ public:
         {
             Trace::EnableAwake(false);
             Logger::trace(L"Disabling Awake...");
-            ResetEvent(send_telemetry_event);
-            ResetEvent(m_hInvokeEvent);
 
             auto exitEvent = CreateEvent(nullptr, false, false, CommonSharedConstants::AWAKE_EXIT_EVENT);
             if (!exitEvent)
diff --git a/src/modules/poweraccent/PowerAccentKeyboardService/KeyboardListener.h b/src/modules/poweraccent/PowerAccentKeyboardService/KeyboardListener.h
index 65d2dca34a..f2358d7135 100644
--- a/src/modules/poweraccent/PowerAccentKeyboardService/KeyboardListener.h
+++ b/src/modules/poweraccent/PowerAccentKeyboardService/KeyboardListener.h
@@ -3,6 +3,7 @@
 #include "KeyboardListener.g.h"
 
 #include <spdlog/stopwatch.h>
+#include <mutex>
 
 namespace winrt::PowerToys::PowerAccentKeyboardService::implementation
 {
diff --git a/src/modules/poweraccent/PowerAccentModuleInterface/dllmain.cpp b/src/modules/poweraccent/PowerAccentModuleInterface/dllmain.cpp
index d726166c41..59a275b0d0 100644
--- a/src/modules/poweraccent/PowerAccentModuleInterface/dllmain.cpp
+++ b/src/modules/poweraccent/PowerAccentModuleInterface/dllmain.cpp
@@ -46,8 +46,7 @@ class PowerAccent : public PowertoyModuleIface
 
 private:
     bool m_enabled = false;
-    HANDLE m_hInvokeEvent;
-    PROCESS_INFORMATION p_info;
+    PROCESS_INFORMATION p_info = {};
 
     bool is_process_running()
     {
@@ -135,7 +134,6 @@ public:
 
     virtual void enable()
     {
-        ResetEvent(m_hInvokeEvent);
         launch_process();
         m_enabled = true;
         Trace::EnablePowerAccent(true);
@@ -146,7 +144,6 @@ public:
         if (m_enabled)
         {
             Logger::trace(L"Disabling QuickAccent... {}", m_enabled);
-            ResetEvent(m_hInvokeEvent);
 
             auto exitEvent = CreateEvent(nullptr, false, false, CommonSharedConstants::POWERACCENT_EXIT_EVENT);
             if (!exitEvent)
diff --git a/src/runner/auto_start_helper.cpp b/src/runner/auto_start_helper.cpp
index 7724877cef..56e11f1c6e 100644
--- a/src/runner/auto_start_helper.cpp
+++ b/src/runner/auto_start_helper.cpp
@@ -156,7 +156,7 @@ bool create_auto_start_task_for_this_user(bool runElevated)
         ExitOnFailure(hr, "Cannot create the trigger: %x", hr);
 
         hr = pTrigger->QueryInterface(
-            IID_ILogonTrigger, (void**)&pLogonTrigger);
+            IID_ILogonTrigger, reinterpret_cast<void**>(&pLogonTrigger));
         pTrigger->Release();
         ExitOnFailure(hr, "QueryInterface call failed for ILogonTrigger: %x", hr);
 
@@ -191,7 +191,7 @@ bool create_auto_start_task_for_this_user(bool runElevated)
 
         // QI for the executable task pointer.
         hr = pAction->QueryInterface(
-            IID_IExecAction, (void**)&pExecAction);
+            IID_IExecAction, reinterpret_cast<void**>(&pExecAction));
         pAction->Release();
         ExitOnFailure(hr, "QueryInterface call failed for IExecAction: %x", hr);