For unknown reasons "Save All" doesn't save the vsprops files.

PCbuild9/pyd.vsprops

@@ -7,7 +7,7 @@
 	>
 	<Tool
 		Name="VCCLCompilerTool"
-		PreprocessorDefinitions="NDEBUG;_USRDLL"
+		PreprocessorDefinitions="NDEBUG"
 		RuntimeLibrary="2"
 	/>
 	<Tool

PCbuild9/pyd_d.vsprops

@@ -9,7 +9,7 @@
 		Name="VCCLCompilerTool"
 		Optimization="0"
 		InlineFunctionExpansion="0"
-		PreprocessorDefinitions="_DEBUG;_USERDLL"
+		PreprocessorDefinitions="_DEBUG"
 		RuntimeLibrary="3"
 	/>
 	<Tool

PCbuild9/pyproject.vsprops

@@ -11,7 +11,7 @@
 		Optimization="2"
 		InlineFunctionExpansion="1"
 		AdditionalIncludeDirectories="..\Include; ..\PC"
-		PreprocessorDefinitions="_CRT_SECURE_NO_DEPRECATE"
+		PreprocessorDefinitions="WIN32;_CRT_SECURE_NO_DEPRECATE"
 		StringPooling="true"
 		ExceptionHandling="0"
 		RuntimeLibrary="0"