Service is being created with executable path pointing to DLL instead of EXE

We have a service installation code which works just fine with .NET Frameworks 4.8 Console application based on `ServiceBase`:

```C#
ManagedInstallerClass.InstallHelper(new string[] { Assembly.GetExecutingAssembly().Location });
```

```C#
using System.ComponentModel;
using System.Configuration.Install;
using System.ServiceProcess;

namespace TestServiceInstall
{
[RunInstaller(true)]
public class TestServiceInstaller : Installer
{
public TestServiceInstaller()
{
ServiceProcessInstaller processInstaller = new ServiceProcessInstaller();
ServiceInstaller serviceInstaller = new ServiceInstaller();

// set the privileges
processInstaller.Account = ServiceAccount.LocalSystem;

serviceInstaller.DisplayName = GlobalVar.SERVICE_NAME;
serviceInstaller.StartType = ServiceStartMode.Automatic;
serviceInstaller.DelayedAutoStart = true;
serviceInstaller.ServicesDependedOn = new string[] { "Tcpip" };

// must be the same as what was set in Program's constructor
serviceInstaller.ServiceName = GlobalVar.SERVICE_NAME;

// installer code here
this.AfterInstall += new InstallEventHandler(ServiceInstaller_AfterInstall);

this.Installers.Add(processInstaller);
this.Installers.Add(serviceInstaller);
}

void ServiceInstaller_AfterInstall(object sender, InstallEventArgs e)
{
ServiceController sc = new ServiceController(GlobalVar.SERVICE_NAME);
sc.Start();
}
}
}
```

We tried to migrate to .NET 6.0 and use this library to install the service in a same way we used to, but what happens is service binary path changed from EXE file to DLL file and we can't figure out how to point it to the EXE file.

We've tried changing `Assembly.GetExecutingAssembly().Location` to `Environment.ProcessPath` but it gives us the following error:

```
System.BadImageFormatException: Bad IL format. The format of the file '%EXE path here%' is invalid..
```

So the question is how can we use this library to install a windows service pointing to EXE file instead of DLL?

Start with ManagedInstallerClass.InstallHelper and the ServiceInstaller setup shown in the issue, then reproduce the .NET 6 installation using Assembly.GetExecutingAssembly().Location and Environment.ProcessPath. Trace how the library derives the service binary path and verify the fix by installing successfully with the service configured to launch the intended executable.

Written by the indexing model from the issue text.