slnx support for nuget.exe

[zitzlthotietoevry]

NuGet Product(s) Involved

NuGet.exe

The Elevator Pitch

Running nuget.exe restore mysolution.slnx just shows an error message:
Invalid input 'mysolution.slnx'. The file type was not recognized.

Would be good if it would properly restore

Additional Context and Details

No response

[nkolev92]

Please consider using dotnet.exe and msbuild.exe restore, they both already support slnx

[FXZFun]

I'm using a custom tool for updating packages that depends on the nuget CLI as well, this is blocking us from using the new .slnx solution format. The tool requires the use of nuget update for legacy projects that dotnet.exe doesn't support.
Since nuget.exe is already using the new solution file parser, it looks like all that would be needed to support this is to enhance the filtering logic to allow .slnx extensions in addition to the .sln extensions for the solution files. I would be happy to provide a PR for this feature if that is welcomed.

[nkolev92]

We'd be happy to take a PR @FXZFun!

[rizi]

@FXZFun will you create a PR, I could also try it, but it's not so easy, there are a lot of places where things must be extended/adapted.

Br