Uninstaller does not remove all registry keys
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When uninstalling 7-Zip, it does not reset or delete file name associations in registry (eg: HKCR\.7z\(default)) that are pointed to 7-Zip keys, it only removes registry keys with key names starting with 'HKCR\7-Zip.'. Furthermore, following registry keys are not removed:
HKCR\Drive\shellex\DragDropHandlers\7-Zip
7-Zip uninstaller should remove and undo all keys.