(Windows) Use Standard Directory values in ExeCommand?

[Zerowalker]

I Got something like this:

    <Package Name="$(var.name)" Manufacturer="$(var.publisher)" Version="$(var.version)"
            UpgradeCode="$(var.guid)" Scope="perMachine">
            <Media Id="1" Cabinet="setup.cab" EmbedCab="yes" />

            <Feature Id="InstallFeature" Title="Install Feature">
                    <ComponentRef Id="file" />
                    <ComponentRef Id="file2" />
            </Feature>

            <CustomAction Id="run_exe" Return="asyncWait" Execute="commit"
                    ExeCommand='create $(var.name) binpath="$(var.path)\$(var.exe)" start=auto' HideTarget="yes" Impersonate="no"
                    BinaryRef="sc" />
            <CustomAction Id="uninstall_exe" Return="asyncWait" Execute="commit"
                    ExeCommand='delete $(var.name)' HideTarget="yes" Impersonate="no"
                    BinaryRef="sc" />
            <InstallExecuteSequence>
                    <Custom Action="run_exe" After="InstallFiles"
                            Condition="NOT Installed AND NOT REMOVE" />
                    <Custom Action="uninstall_exe" After="InstallFiles"
                            Condition="Installed AND REMOVE" />
            </InstallExecuteSequence>

            <Binary Id="sc" SourceFile="C:\Windows\System32\sc.exe" />
            
            <StandardDirectory Id="ProgramFiles64Folder">
                    <Directory Id="INSTALLLOCATION" Name="$(var.name)">
                            <Component Id="file" DiskId="1">
                                <File Id="executable" Name="$(var.exe)" Source="$(var.path)\$(var.exe)" />
                            </Component>
                             <Component Id="file2" DiskId="1">
                                <File Id="config" Name="config.toml" Source="$(var.configPath)\config.toml"/>
                            </Component>
                    </Directory>
            </StandardDirectory>
    </Package>

The files are installed into "programfiles$(var.name)".
And i want to create a service to the exe in that path but I don't know how to point there without manually setting the whole path.
(see "ExeCommand" in "CustomAction" run_exe)

It would also be nice to use a Standard Directory for the "Binary" so I can use "SystemFolder" instead of manually setting "C:\Windows\System32".

I might just be going at this the wrong way of course, so please do tell if that's the case, I'm a complete beginner at this:)

Thanks!

[jcasale]

Why are you using a CA with sc.exe to manage services?

See https://wixtoolset.org/docs/schema/wxs/serviceinstall/.