Preview Handler with MSIX Packaging Tool?

I've made some progress in getting the MSIX Manifest file to not return errors and previews are now partially working. Here's the updated manifest file.

<?xml version="1.0" encoding="utf-8"?>
<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap2="http://schemas.microsoft.com/appx/manifest/uap/windows10/2" xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3" xmlns:uap10="http://schemas.microsoft.com/appx/manifest/uap/windows10/10" xmlns:desktop2="http://schemas.microsoft.com/appx/manifest/desktop/windows10/2" xmlns:desktop7="http://schemas.microsoft.com/appx/manifest/desktop/windows10/7" xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" xmlns:com="http://schemas.microsoft.com/appx/manifest/com/windows10" IgnorableNamespaces="uap uap2 uap3 uap10 desktop2 desktop7 rescap com">
  <!--Package created by MSIX Packaging Tool version: 1.2024.405.0-->
  <Identity Name="CompanyName.AppName" Publisher="---------------------------------------" Version="1.1.1.0" ProcessorArchitecture="x86" />
  <Properties>
    <DisplayName>App Name</DisplayName>
    <PublisherDisplayName>Publisher Name</PublisherDisplayName>
    <Description>App Name</Description>
    <Logo>Assets\StoreLogo.png</Logo>
    <uap10:PackageIntegrity>
      <uap10:Content Enforcement="on" />
    </uap10:PackageIntegrity>
  </Properties>
  <Resources>
    <Resource Language="en-us" />
  </Resources>
  <Dependencies>
    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.17763.0" MaxVersionTested="10.0.22000.1" />
    <PackageDependency Name="Microsoft.WindowsAppRuntime.1.4" MinVersion="4000.1010.1349.0" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" />
  </Dependencies>
  <Applications>
    <Application Id="EXENAME" Executable="VFS\ProgramFilesX86\App_Name\AppName.exe" EntryPoint="Windows.FullTrustApplication">
      <uap:VisualElements BackgroundColor="transparent" DisplayName="App_Name" Square150x150Logo="Assets\APPNAME-Square150x150Logo.png" Square44x44Logo="Assets\APPNAME-Square44x44Logo.png" Description="App Name">
        <uap:DefaultTile Wide310x150Logo="Assets\APPNAME-Wide310x150Logo.png" Square310x310Logo="Assets\APPNAME-Square310x310Logo.png" Square71x71Logo="Assets\APPNAME-Square71x71Logo.png" />
      </uap:VisualElements>
      <Extensions>
	    <!-- SurrogateServer entry added for linking preview handler -->
        <com:Extension Category="windows.comServer">
          <com:ComServer>
            <com:SurrogateServer>
              <com:Class Id="64644512-C345-469F-B5FB-EB351E20129D" Path="VFS\ProgramFilesX86\App_Name\ExtPreview.dll" ThreadingModel="STA" />
            </com:SurrogateServer>
          </com:ComServer>
        </com:Extension>
        <desktop7:Extension Category="windows.shortcut">
          <desktop7:Shortcut File="[{Common Programs}]\App_Name\App_Name.lnk" Icon="[{Package}]\VFS\ProgramFilesX86\App_Name\AppName.exe" />
        </desktop7:Extension>
        <uap3:Extension Category="windows.fileTypeAssociation">
          <uap3:FileTypeAssociation Name="ext">
            <uap:SupportedFileTypes>
              <uap:FileType>.ext</uap:FileType>
            </uap:SupportedFileTypes>
            <uap:Logo>Assets\ext.png</uap:Logo>
            <uap2:SupportedVerbs>
              <uap3:Verb Id="open" Parameters=""%1"">open</uap3:Verb>
            </uap2:SupportedVerbs>
			<!-- DesktopPreviewHandler entry added for linking preview handler -->
            <desktop2:DesktopPreviewHandler Clsid="64644512-C345-469F-B5FB-EB351E20129D" />
          </uap3:FileTypeAssociation>
        </uap3:Extension>
      </Extensions>
    </Application>
  </Applications>
  <Capabilities>
    <rescap:Capability Name="runFullTrust" />
  </Capabilities>
</Package>

The preview now shows in Windows Explorer, but there are a couple of issues.

- It doesn't correctly take into account screen scale. When Windows Explorer is on a screen with > 100% scale the preview is shown too large and doesn't fit the preview area. This doesn't happen with the same preview handler installed using my Inno Setup installer.

- The preview doesn't show at all in File Explorer from within my app. It shows a blank white canvas. Perhaps this is related to the scale issue and it's being drawn entirely outside the preview canvas?

If anyone has experienced similar issues then I'd appreciate any help.