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Hi,@Finn. Welcome to Microsoft Q&A forum.
It doesn’t work with .NET Framework based projects. According to this thread: Publish a single file app does not create a single file and this link(.NET 5), you may need to use .NET 6 or higher versions of .NET to make it work.
Based on my test, by using .NET 6, if you choose framework-dependent to publish, you will get two files(.exe, .pdb). If you choose Self-Contained to publish, you will still get some (not a single file) files.
For more information on single file deployments, you could refer to Single-file deployment.
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