For unknown reasons "Save All" doesn't save the vsprops files.
diff --git a/PCbuild9/pyproject.vsprops b/PCbuild9/pyproject.vsprops
index e1c9023..76a7733 100644
--- a/PCbuild9/pyproject.vsprops
+++ b/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"