Hello! The VS Solution team has created a standalone OSS library for interacting with solution files in the microsoft/vs-solutionpersistence repository. The .NET CLI is moving to adopt this library for the upcoming .NET SDK 9.0.200 release, and we'd encourage all tools that manipulate solutions to move to this library as well.

In addition to being the canonical parser library, you also get support for handling both .sln files and the new .slnx format.