Adding environment variable for only one .NET application in Windows

Scenario:

We have multiple different .NET Core applications on Windows host. We want to instrument these applications one by one.

Solution:

You can set the environment variable on the application startup in the batch script.
Instead of starting the executable directly, you can run a batch-file instead, which sets the environment variables and then starts the executable.
In the case of windows-services, you can also set the environment variables per service via the registry.