diff --git a/nvdaHelper/archBuild_sconscript b/nvdaHelper/archBuild_sconscript
index f6dfc30ab24..c8599675cc4 100644
--- a/nvdaHelper/archBuild_sconscript
+++ b/nvdaHelper/archBuild_sconscript
@@ -92,7 +92,11 @@ env.Append(
 		('_WIN32_WINNT','_WIN32_WINNT_WIN7')
 	]
 )
-env.Append(CCFLAGS=['/W3','/WX'])
+env.Append(CCFLAGS=[
+	'/W3',
+	'/WX',
+	'/std:c++17'
+])
 if 'analyze' in debug:
 	env.Append(CCFLAGS=['/analyze'])
 	# Disable: Inconsistent annotation for 'x': this instance has no annotations.
diff --git a/nvdaHelper/localWin10/oneCoreSpeech.cpp b/nvdaHelper/localWin10/oneCoreSpeech.cpp
index a0600c20582..2421515d461 100644
--- a/nvdaHelper/localWin10/oneCoreSpeech.cpp
+++ b/nvdaHelper/localWin10/oneCoreSpeech.cpp
@@ -88,7 +88,7 @@ void __stdcall ocSpeech_speak(OcSpeech* instance, char16 *text) {
 	}).then([instance, markersStr] (IBuffer^ buffer) {
 		// Data has been read from the speech stream.
 		// Pass it to the callback.
-		byte* bytes = getBytes(buffer);
+		BYTE* bytes = getBytes(buffer);
 		instance->callback(bytes, buffer->Length, markersStr->c_str());
 	}).then([instance] (task<void> previous) {
 		// Catch any unhandled exceptions that occurred during these tasks.
diff --git a/nvdaHelper/remote/COMProxyRegistration.cpp b/nvdaHelper/remote/COMProxyRegistration.cpp
index d12f44602e4..7abfd6a32e4 100644
--- a/nvdaHelper/remote/COMProxyRegistration.cpp
+++ b/nvdaHelper/remote/COMProxyRegistration.cpp
@@ -16,7 +16,6 @@ This license can be found at:
 #include <cwchar>
 #include <string>
 #include <locale>
-#include <codecvt>
 #include <vector>
 #define WIN32_LEAN_AND_MEAN 
 #define CINTERFACE
@@ -140,8 +139,36 @@ COMProxyRegistration_t* registerCOMProxy(wchar_t* dllPath) {
 		for(unsigned short idx=0;idx<fileInfo.TableSize;++idx) {
 			IID iid=*(fileInfo.pStubVtblList[idx]->header.piid);
 			CLSID clsidBackup={0};
-			wstring_convert<codecvt_utf8_utf16<wchar_t>> converter;
-			wstring name=converter.from_bytes(fileInfo.pNamesArray[idx]);
+			const auto pName = fileInfo.pNamesArray[idx];
+			const int nameLength=MultiByteToWideChar(
+				CP_UTF8,  // Code Page for conversion
+				0,  // DWFlags
+				pName,  // lpMultiByteStr - string to convert
+				-1,  // cbMultiByte - size (bytes of pName). -1 means process whole string and pName must be null terminated.
+				nullptr,  // lpWideCharStr -  don't fetch anything this time
+				0 // cchWideChar - character count of lpWideCharStr. When 0, lpWideCharStr is not used, just return number of characters after conversion (including null character).
+			);
+			if (0 == nameLength) {
+				LOG_ERROR(L"Unable to  get name length for MultiByteToWideChar conversion for entry "<<idx<<L" in ProxyFileInfo, error "<<GetLastError());
+				continue;
+			}
+			wstring name(nameLength,L'\0');
+			const int charsConverted= MultiByteToWideChar(
+				CP_UTF8,  // Code Page for conversion
+				0,  // DWFlags
+				pName,  // lpMultiByteStr - string to convert
+				-1,  // cbMultiByte - size (bytes of pName). -1 means process whole string and pName must be null terminated.
+				name.data(),  // lpWideCharStr
+				nameLength  // cchWideChar
+			);
+			if (0 == charsConverted) {
+				LOG_ERROR(L"Unable to perform MultiByteToWideChar conversion for entry "<<idx<<L" in ProxyFileInfo, error "<<GetLastError());
+				continue;
+			}
+			const auto indexOfFirstNull = name.find_first_of(L'\0');
+			if(wstring::npos != indexOfFirstNull) {
+				name.resize(indexOfFirstNull );
+			}
 			// Fetch the old CLSID for this interface if one is set, so we can replace it on deregistration.
 			// If not set, then we'll use the standard marshaler clsid on deregistration.
 			res=CoGetPSClsid(iid,&clsidBackup);
diff --git a/nvdaHelper/remote/WinWord/Fields.cpp b/nvdaHelper/remote/WinWord/Fields.cpp
index 3e64241c658..fadf7c75cac 100644
--- a/nvdaHelper/remote/WinWord/Fields.cpp
+++ b/nvdaHelper/remote/WinWord/Fields.cpp
@@ -123,13 +123,13 @@ bool Fields::hasLinks(){
 }
 
 
-std::experimental::optional<int> Fields::getEndOfPageNumberFieldAtIndex(const int index){
+std::optional<int> Fields::getEndOfPageNumberFieldAtIndex(const int index){
 	for( auto&& pageNum : m_pageNumbers ){
 		if(inRange(index, pageNum.first, pageNum.second)){
 			return pageNum.second;
 		}
 	}
-	return std::experimental::optional<int>();
+	return std::optional<int>();
 }
 
 } // end namespace WinWord
\ No newline at end of file
diff --git a/nvdaHelper/remote/WinWord/Fields.h b/nvdaHelper/remote/WinWord/Fields.h
index d0ef33c0163..dd870786674 100644
--- a/nvdaHelper/remote/WinWord/Fields.h
+++ b/nvdaHelper/remote/WinWord/Fields.h
@@ -16,7 +16,7 @@ This license can be found at:
 
 #define WIN32_LEAN_AND_MEAN 
 #include <vector>
-#include <boost/optional.hpp>
+#include <optional>
 
 struct IDispatch;
 namespace WinWord {
@@ -49,7 +49,7 @@ namespace WinWord {
 		* @param index Find a range that this index is part of.
 		* @returns an optional value, if a range exists the end index is returned of visible text range.
 		*/
-		std::experimental::optional<int> getEndOfPageNumberFieldAtIndex(const int index);
+		std::optional<int> getEndOfPageNumberFieldAtIndex(const int index);
 
 		Fields(const Fields&) = delete; // Copy constructor disabled, no implementation.
 		Fields& operator=(const Fields&) = delete; // Assignment disabled, no implementation.
diff --git a/nvdaHelper/remote/winword.cpp b/nvdaHelper/remote/winword.cpp
index 39bac18c944..add5eeb6695 100644
--- a/nvdaHelper/remote/winword.cpp
+++ b/nvdaHelper/remote/winword.cpp
@@ -21,7 +21,7 @@ This license can be found at:
 #include <oleacc.h>
 #include <common/xml.h>
 #include <common/log.h>
-#include <boost/optional.hpp>
+#include <optional>
 #include "nvdaHelperRemote.h"
 #include "nvdaInProcUtils.h"
 #include "nvdaInProcUtils.h"
@@ -751,7 +751,7 @@ inline bool generateFootnoteEndnoteXML(IDispatch* pDispatchRange, wostringstream
 	return true;
 }
 
-std::experimental::optional<int> getSectionBreakType(IDispatchPtr pDispatchRange ) {
+std::optional<int> getSectionBreakType(IDispatchPtr pDispatchRange ) {
 	// The following case should handle where we have the page break character ('0x0c') shown with '|p|'
 	//	first section|p|
 	//	second section.
@@ -817,7 +817,7 @@ std::experimental::optional<int> getSectionBreakType(IDispatchPtr pDispatchRange
 	return type;
 }
 
-std::experimental::optional<float>
+std::optional<float>
 getStartOfRangeDistanceFromEdgeOfDocument(IDispatchPtr pDispatchRange) {
 	float rangePos = -1.0f;
 	auto res = _com_dispatch_raw_method( pDispatchRange, wdDISPID_RANGE_INFORMATION,
@@ -831,7 +831,7 @@ getStartOfRangeDistanceFromEdgeOfDocument(IDispatchPtr pDispatchRange) {
 	return rangePos;
 }
 
-std::experimental::optional< std::pair<float, float> >
+std::optional< std::pair<float, float> >
 calculatePreAndPostColumnOffsets(IDispatchPtr pDispatchPageSetup) {
 	float leftMargin = -1.0f;
 	auto res = _com_dispatch_raw_propget( pDispatchPageSetup, wdDISPID_PAGESETUP_LEFTMARGIN,
@@ -1182,8 +1182,8 @@ void winword_getTextInRange_helper(HWND hwnd, winword_getTextInRange_args* args)
 		if(text) {
 			int noteCharOffset=-1;
 			bool isNoteChar=false;
-			std::experimental::optional<int> pageBreakCharIndex;
-			std::experimental::optional<int> columnBreakCharIndex;
+			std::optional<int> pageBreakCharIndex;
+			std::optional<int> columnBreakCharIndex;
 			if(!isFormField) {
 				//Force a new chunk before and after control+b (note characters)
 				for(int i=0;text[i]!=L'\0';++i) {
diff --git a/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.cpp b/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.cpp
index 47fdfd22ae9..9d325843394 100755
--- a/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.cpp
+++ b/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.cpp
@@ -16,7 +16,7 @@ This license can be found at:
 #include <functional>
 #include <vector>
 #include <map>
-#include <boost/optional.hpp>
+#include <optional>
 #include <windows.h>
 #include <set>
 #include <string>
@@ -287,13 +287,13 @@ void GeckoVBufBackend_t::versionSpecificInit(IAccessible2* pacc) {
 	SysFreeString(toolkitVersion);
 }
 
-experimental::optional<int>
+optional<int>
 getIAccessible2UniqueID(IAccessible2* targetAcc) {
 	int ID = 0;
 	//Get ID -- IAccessible2 uniqueID
 	if (targetAcc->get_uniqueID((long*)&ID) != S_OK) {
 		LOG_DEBUG(L"pacc->get_uniqueID failed");
-		return experimental::optional<int>();
+		return optional<int>();
 	}
 	return ID;
 }
@@ -301,10 +301,10 @@ getIAccessible2UniqueID(IAccessible2* targetAcc) {
 class LabelInfo {
 public:
 	bool isVisible;
-	std::experimental::optional<int> ID;
+	optional<int> ID;
 };
 
-using OptionalLabelInfo = std::experimental::optional< LabelInfo >;
+using OptionalLabelInfo = optional< LabelInfo >;
 OptionalLabelInfo GeckoVBufBackend_t::getLabelInfo(IAccessible2* pacc2) {
 	CComQIPtr<IAccessible2_2> pacc2_2=pacc2;
 	if (!pacc2_2) return OptionalLabelInfo();
@@ -657,7 +657,7 @@ VBufStorage_fieldNode_t* GeckoVBufBackend_t::fillVBuf(
 	// Whether the name of this node has been explicitly set (as opposed to calculated by descendant)
 	const bool nameIsExplicit = IA2AttribsMapIt != IA2AttribsMap.end() && IA2AttribsMapIt->second == L"true";
 	// Whether the name is the content of this node.
-	std::experimental::optional<LabelInfo> labelInfo_;
+	optional<LabelInfo> labelInfo_;
 	// A version of the getIdForVisibleLabel function that caches its result
 	auto isLabelVisibleCached = [&]() {
 		if (!labelInfo_) {
@@ -673,7 +673,7 @@ VBufStorage_fieldNode_t* GeckoVBufBackend_t::fillVBuf(
 		if (!labelInfo_) {
 			labelInfo_ = getLabelInfo(pacc);
 		}
-		experimental::optional<int> id;
+		optional<int> id;
 		if (labelInfo_) {
 			id = labelInfo_->ID;
 		}
diff --git a/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.h b/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.h
index d59ed2bec4e..9537aa19565 100755
--- a/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.h
+++ b/nvdaHelper/vbufBackends/gecko_ia2/gecko_ia2.h
@@ -16,7 +16,7 @@ This license can be found at:
 #define VIRTUALBUFFER_BACKENDS_EXAMPLE_H
 
 #include <vbufBase/backend.h>
-#include <boost/optional.hpp>
+#include <optional>
 
 class LabelInfo;
 
@@ -42,7 +42,7 @@ class GeckoVBufBackend_t: public VBufBackend_t {
 	bool hasEncodedAccDescription;
 	std::wstring toolkitName;
 
-	std::experimental::optional< LabelInfo > getLabelInfo(IAccessible2* pacc2);
+	std::optional< LabelInfo > getLabelInfo(IAccessible2* pacc2);
 	CComPtr<IAccessible2> getLabelElement(IAccessible2_2* element);
 	CComPtr<IAccessible2> getSelectedItem(IAccessible2* container,
 		const std::map<std::wstring, std::wstring>& attribs);