handle diagnostics

Handle diagnostics focuses on the detective work involved when Windows refuses to delete a file because it is still in use. The tagged discussion explains how open file handles, network access, antivirus scans, and DLL loading can keep a file locked, while highlighting why Windows often provides limited detail about the process responsible. It draws on an explanation from Microsoft Azure CTO Mark Russinovich in a Microsoft Developer video and frames the issue as a long-standing Windows usability challenge. This archive is useful for readers trying to understand the technical causes behind “file is in use” messages and the investigation needed to identify what is holding a file open.