VS2010 introduced ToolsVersion="4.0" . The schemas helped separate project behavior from IDE-specific cruft, paving the way for today’s SDK-style projects.
Here’s an interesting, tech-history-style post about – perfect for a dev blog, LinkedIn, or forum discussion. 🕰️ Rediscovering VS2010 Schemas: The Blueprint Behind Classic .NET Projects Before .csproj edits became a daily power move, before dotnet new was a thing, there was Visual Studio 2010 — and its often-overlooked but critical XML schemas . vs2010schemas
You could drop custom .xsd into the schema cache and get IntelliSense for your own build tasks. Power move for internal tools. 🧩 A Real Example Open any .csproj from 2010-2015: VS2010 introduced ToolsVersion="4