DllMapDemo Why do you use Assembly? But I want to use NativeAOT then it happens cause Assembly doesn't work for NativeAOT

**Before you open an issue**

If the issue is:
[DllMapDemo](https://github.com/dotnet/samples/tree/main/core/extensions/DllMapDemo)
That is why Assembly and Marshal can't be successful for NativeAOT.

**Issue description**
Check out:
If I ran test from directory native

[<]Problem replacement with string as path to XML and read it.]

**Target framework**
Net 8.x

Check the .NET target framework(s) being used, and include the version number(s).

- [X] .NET Core
- [ ] .NET Framework
- [ ] .NET Standard

How do I pass current operating system if I use like this:
```

```

I need to know without Assembly in NativeAOT support. Thanks!