My first job at Microsoft was to make a system that could catalog the “contracts” or “extension points” installed in Windows. I’d define a category of extension

My first job at Microsoft was to make a system that could catalog the “contracts” or “extension points” installed in Windows. I’d define a category of extensions, such as a COM object registration and my program used normalized levenshtein difference to warn about potential typos. After removing all matching fields names from the instance & class I compared the edit distance in the remaining cross product. If any had a normalized distance < N it produced a warning. It even helped me find a mistyped GUID in a prerelease copy of Windows.