add a manifest file

https://docs.microsoft.com/en-us/windows/win32/sbscs/application-manifests
one for i64 and x86 each

visualc/ngspice-x86.exe.manifest

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+    <assemblyIdentity 
+        type="win32" 
+        name="Microsoft.Windows.ngspice"
+        version="00031.00003.00002.00001"
+        processorArchitecture="x86"
+    />
+    <description> ngspice: circuit simulator for mixed signal circuits </description>
+    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+        <security>
+            <requestedPrivileges>
+                <requestedExecutionLevel
+                    level="asInvoker"
+                    uiAccess="false"
+                />   
+            </requestedPrivileges>
+        </security>
+    </trustInfo>
+    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1"> 
+        <application> 
+            <!-- Windows 10 --> 
+            <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+            <!-- Windows 8.1 -->
+            <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+            <!-- Windows Vista -->
+            <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/> 
+            <!-- Windows 7 -->
+            <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+            <!-- Windows 8 -->
+            <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+        </application> 
+    </compatibility>
+</assembly>

visualc/ngspice.exe.manifest

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
+    <assemblyIdentity 
+        type="win32" 
+        name="Microsoft.Windows.ngspice"
+        version="00031.00003.00002.00001"
+        processorArchitecture="ia64"
+    />
+    <description> ngspice: circuit simulator for mixed signal circuits </description>
+    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
+        <security>
+            <requestedPrivileges>
+                <requestedExecutionLevel
+                    level="asInvoker"
+                    uiAccess="false"
+                />   
+            </requestedPrivileges>
+        </security>
+    </trustInfo>
+    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1"> 
+        <application> 
+            <!-- Windows 10 --> 
+            <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+            <!-- Windows 8.1 -->
+            <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+            <!-- Windows Vista -->
+            <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/> 
+            <!-- Windows 7 -->
+            <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+            <!-- Windows 8 -->
+            <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+        </application> 
+    </compatibility>
+</assembly>

visualc/vngspice.vcxproj

@@ -168,9 +168,11 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <LinkIncremental>false</LinkIncremental>
     <GenerateManifest>false</GenerateManifest>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <LinkIncremental>false</LinkIncremental>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|Win32'">
     <LinkIncremental>false</LinkIncremental>
@@ -182,21 +184,25 @@
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|x64'">
     <LinkIncremental>false</LinkIncremental>
     <GenerateManifest>false</GenerateManifest>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release|x64'">
     <LinkIncremental>false</LinkIncremental>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|Win32'">
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|x64'">
     <LinkIncremental>false</LinkIncremental>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|Win32'">
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|x64'">
     <LinkIncremental>false</LinkIncremental>
+    <EmbedManifest>true</EmbedManifest>
   </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <PreBuildEvent>
@@ -237,6 +243,9 @@
     <PostBuildEvent>
       <Command>make-install-vngspiced.bat $(OutDir)</Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <PreBuildEvent>
@@ -285,6 +294,9 @@
       make-install-vngspice.bat $(OutDir)
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <PreBuildEvent>
@@ -330,6 +342,9 @@
       make-install-vngspiced.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <PreBuildEvent>
@@ -383,6 +398,9 @@
       make-install-vngspice.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|Win32'">
     <PreBuildEvent>
@@ -423,6 +441,9 @@
     <PostBuildEvent>
       <Command>make-install-vngspiced.bat $(OutDir)</Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_release|Win32'">
     <PreBuildEvent>
@@ -469,6 +490,9 @@
     <PostBuildEvent>
       <Command>make-install-vngspice.bat $(OutDir)</Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_debug|x64'">
     <PreBuildEvent>
@@ -514,6 +538,9 @@
       make-install-vngspiced.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_release|x64'">
     <PreBuildEvent>
@@ -565,6 +592,9 @@
       make-install-vngspice.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|Win32'">
     <PreBuildEvent>
@@ -612,6 +642,9 @@
     <PostBuildEvent>
       <Command>make-install-vngspice.bat $(OutDir)</Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseOMP|x64'">
     <PreBuildEvent>
@@ -666,6 +699,9 @@
       make-install-vngspice.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|Win32'">
     <PreBuildEvent>
@@ -713,6 +749,9 @@
     <PostBuildEvent>
       <Command>make-install-vngspice.bat $(OutDir)</Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice-x86.exe.manifest</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='console_release_omp|x64'">
     <PreBuildEvent>
@@ -765,6 +804,9 @@
       make-install-vngspice.bat $(OutDir) 64
       </Command>
     </PostBuildEvent>
+    <Manifest>
+      <AdditionalManifestFiles>$(ProjectDir)ngspice.exe.manifest %(AdditionalManifestFiles)</AdditionalManifestFiles>
+    </Manifest>
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="..\src\ciderlib\oned\oneddefs.h" />