This guide shows you how to open DLL Files on a Windows 11/10 PC using dotPeek decompiler and Microsoft Visual Studio.

Launch Microsoft Visual Studio, and open one of your C# Winform projects. Move to the Solution Explorer, and double-click your project's startup form to view it in design mode.

It's easy to miss that you've opened a read-only file in Visual Studio: When you open a file you can't change, a tiny little lock icon appears on the tab of the editor window to the right of the ...