Enable 'W1073 Combining signed type and unsigned 64-bit type - treated as an unsigned type' warning for all project. Is off by default for some reason. Did not cause new warnings.

ISHelp/ISHelpGen/ISHelpGen.dproj

@@ -70,6 +70,7 @@
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
         <DCC_IMPLICIT_INTEGER_CAST_LOSS>true</DCC_IMPLICIT_INTEGER_CAST_LOSS>
         <DCC_IMPLICIT_CONVERSION_LOSS>true</DCC_IMPLICIT_CONVERSION_LOSS>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/Compil32.dproj

@@ -40,6 +40,7 @@
         <DCC_Namespace>System;Vcl;Vcl.Imaging;$(DCC_Namespace)</DCC_Namespace>
         <DCC_SYMBOL_DEPRECATED>false</DCC_SYMBOL_DEPRECATED>
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
         <Custom_Styles>&quot;Windows11 Modern Dark|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Windows11_Modern_Dark.vsf&quot;</Custom_Styles>
     </PropertyGroup>

Projects/ISCC.dproj

@@ -43,6 +43,7 @@
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
         <DCC_IMPLICIT_INTEGER_CAST_LOSS>true</DCC_IMPLICIT_INTEGER_CAST_LOSS>
         <DCC_IMPLICIT_CONVERSION_LOSS>true</DCC_IMPLICIT_CONVERSION_LOSS>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/ISCmplr.dproj

@@ -41,6 +41,7 @@
         <DCC_Namespace>System;$(DCC_Namespace)</DCC_Namespace>
         <DCC_SYMBOL_DEPRECATED>false</DCC_SYMBOL_DEPRECATED>
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/ISPP.dproj

@@ -40,6 +40,7 @@
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
         <DCC_IMPLICIT_INTEGER_CAST_LOSS>true</DCC_IMPLICIT_INTEGER_CAST_LOSS>
         <DCC_IMPLICIT_CONVERSION_LOSS>true</DCC_IMPLICIT_CONVERSION_LOSS>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/ISSigTool.dproj

@@ -70,6 +70,7 @@
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
         <DCC_IMPLICIT_INTEGER_CAST_LOSS>true</DCC_IMPLICIT_INTEGER_CAST_LOSS>
         <DCC_IMPLICIT_CONVERSION_LOSS>true</DCC_IMPLICIT_CONVERSION_LOSS>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/Setup.dproj

@@ -67,6 +67,7 @@
         <DCC_Namespace>System;Vcl;$(DCC_Namespace)</DCC_Namespace>
         <DCC_SYMBOL_DEPRECATED>false</DCC_SYMBOL_DEPRECATED>
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">

Projects/SetupCustomStyle.dproj

@@ -67,6 +67,7 @@
         <DCC_Namespace>System;Vcl;$(DCC_Namespace)</DCC_Namespace>
         <DCC_SYMBOL_DEPRECATED>false</DCC_SYMBOL_DEPRECATED>
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
         <Custom_Styles>&quot;Slate Classico|VCLSTYLE|$(BDSCOMMONDIR)\Styles\SlateClassico.vsf&quot;;&quot;Windows11 Modern Dark|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Windows11_Modern_Dark.vsf&quot;;&quot;Windows11 Modern Light|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Windows11_Modern_Light.vsf&quot;;&quot;Windows11 Polar Dark|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Windows11_Polar_Dark.vsf&quot;;&quot;Windows11 Polar Light|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Windows11_Polar_Light.vsf&quot;;Zircon|VCLSTYLE|$(BDSCOMMONDIR)\Styles\Zircon.vsf</Custom_Styles>
     </PropertyGroup>

Projects/SetupLdr.dproj

@@ -68,6 +68,7 @@
         <DCC_SYMBOL_PLATFORM>false</DCC_SYMBOL_PLATFORM>
         <DCC_IMPLICIT_INTEGER_CAST_LOSS>true</DCC_IMPLICIT_INTEGER_CAST_LOSS>
         <DCC_IMPLICIT_CONVERSION_LOSS>true</DCC_IMPLICIT_CONVERSION_LOSS>
+        <DCC_COMBINING_SIGNED_UNSIGNED64>true</DCC_COMBINING_SIGNED_UNSIGNED64>
         <DCC_TypedAtParameter>true</DCC_TypedAtParameter>
         <DCC_Define>SETUPLDRPROJ;$(DCC_Define)</DCC_Define>
     </PropertyGroup>