The latest version can now even open SLNX files, which are the newest format that removes a lot of the stuff that makes VS Solution files painful to maintain in source control.
Yes, it can pretty much do everything you’d get in Visual Studio.
Of course it can, that's the baseline for a VS competitor lol
Well VS Code can’t open sone of VS project types, more specifically it couldn’t open the one based on JS and JS build tools. I’ll check with Rider.
It depends on the platform. For example, Rider on Mac will not open vscproj/vcxproj files, because it doesn't support C++ really on non Windows. But I think that is mostly because it would need to use a different C++ compiler and that is non trivial. I would imagine it would also struggle with project types that are not normal (VS extensions, installer projects etc) and C++/CLI as that is not supported outside of Windows too (and I think uses the standard vsc[x]proj file format anyway...)