Próbuję Wix 3.6 i tak właśnie wygląda teraz:

<?xml version="1.0" encoding="UTF-8"?>

<Directory Id="TARGETDIR" Name="SourceDir">
    <Directory Id="myappINSTALLDIR" Name="myapp5Service">
        <Component Id="SampleServiceComponent" DiskId="1" Guid="6f51c0f3-776c-4aec-a200-1f199352c6c3" Win64="yes">
          <File Id="myapp5.WindowsService.exe" Name="myapp5.WindowsService.exe" Source="$(var.myapp.WindowsService.TargetDir)\myapp5.WindowsService.exe" KeyPath='yes'/>
          ...

          <ServiceInstall Id="InstallmyappService" DisplayName="myappService" Name="myapp5.WindowsService.exe" Description="myapp 5 Service - För effektivare och enklare operationsplanering" Account="LocalSystem" ErrorControl="normal" Start="auto" Type="ownProcess" Vital="yes" />
          <ServiceControl Id="ControlmyappService" Name="myapp5.WindowsService.exe" Start="install" Stop="both" Remove="uninstall" Wait="yes" />
        </Component>
    </Directory>
</Directory>


<WixVariable Id="WixUIBannerBmp" Value="$(var.ProjectDir)\Image\myappTopBanner.bmp" />
<WixVariable Id="WixUIDialogBmp" Value="$(var.ProjectDir)\Image\myappDialogBackground.bmp" />

<Property Id="WIXUI_INSTALLDIR" Value="myappINSTALLDIR" />
<UIRef Id="WixUI_InstallDir" />

<Feature Id="ProductFeature" Title="Wix_myapp.WindowsService" Level="1">
  <ComponentRef Id="SampleServiceComponent" />
</Feature>
<Media Id="1" Cabinet="SampleServiceComponent.cab" EmbedCab="yes" />
</Product>

Teraz muszę dodać okno dialogowe do konfiguracji Wix, gdzie jeden appSetting i jeden baseadress (WCF) jest ustawiony na app.config. Najczęściej należy to zrobić przed instalacją, ponieważ zadecyduje ona o nazwie usługi Windows, którą instaluje Wix.

I na przykład byłoby świetnie!

Edytuj 1:

    <WixVariable Id="WixUIBannerBmp" Value="$(var.ProjectDir)\Image\myappTopBanner.bmp" />
<WixVariable Id="WixUIDialogBmp" Value="$(var.ProjectDir)\Image\myappDialogBackground.bmp" />

<Property Id="SERVICEADDRESS" Value="http://serviceaddress"/>
<Property Id="WIXUI_INSTALLDIR" Value="myappINSTALLDIR" />
<UIRef Id="WixUI_InstallDir" />

<util:XmlFile Id="UpdateBaseAddress"
  Action="setValue"
  File="$(var.myapp.WindowsService.TargetDir)\myapp5.WindowsService.exe.config"
  SelectionLanguage="XPath"
  Permanent="yes"
  ElementPath="/configuration/applicationSettings/ServiceName"
  Name="baseAddress" Value="[SERVICEADDRESS]" />

<Feature Id="ProductFeature" Title="Wix_myapp.WindowsService" Level="1">
  <ComponentRef Id="SampleServiceComponent" />
</Feature>
<Media Id="1" Cabinet="SampleServiceComponent.cab" EmbedCab="yes" />
</Product>