Charles Milette focused on improving resource management within the microsoft/WindowsAppSDK repository, specifically targeting stability in background task handling. He addressed a resource leak in Task.cpp by refining the use of CoCreateInstance, ensuring proper COM object lifecycle management in C++. Additionally, Charles removed outdated code, including the erroneous UniversalBGTask.Task.Run definition and hardcoded GUIDs, aligning the implementation with project guidelines and issue tracker recommendations. His work enhanced the reliability and maintainability of Windows development projects that depend on background tasks. Over the month, Charles demonstrated depth in Windows development, COM, and background task management, delivering targeted, quality improvements.