> Even if we've managed to rebuild and patch Hyper-V Manager from source, this is not enough for a real community project to take place. As much as I would like to just upload the decompiled source code to GitHub to start making significant changes to it, there's no legal standing for this project

I did almost exactly the same thing with Microsoft Reporting Services / ReportViewer several years ago, but decided to go a step further and published whole thing on a GitHub and uploaded packages for .NET Core/5/6/7/8 to NuGet - both platform controlled by Microsoft.

Both repo and packages are still up. Only legal inquires came from other companies asking if they can really use it. For reasons I cannot fathom, Microsoft MVPs and community managers direct anyone asking for .NET Core version of ReportViewer to my recompiled package and sources, with links all over Microsoft's forums, reddit and Q&A sites. GitHub analytics shows some visitors come via direct links from docs.microsoft.com.

I guess Microsoft just doesn't care. Hell, they allow scripts for one-click product activation bypass to be hosted on GitHub.