Worked on refactoring the file dialog subsystem in the ProteoWizard/pwiz repository, focusing on structural improvements to support future user-facing features. The approach centered on reorganizing the dialog hierarchy by renaming OpenDataSourceDialog to BaseFileDialogNE and introducing stub classes for OpenFileDialogNE and OpenDataSourceDialog, laying the groundwork for incremental development. The Open() method was moved to OpenFileDialogNE, enabling easier subclass customization and improved modularity. This work emphasized code organization, object-oriented design, and refactoring using C# and Windows Forms, resulting in a more maintainable and testable architecture that facilitates future enhancements without introducing new user-facing functionality at this stage.