HKEY_CLASSES_ROOT\.ext
allows to associate a file type (which apparently is identified by its file name extension such as .mp3
, .txt
or more generally .ext
) with an (existing) application. This application is identified by ProgId which is stored in the registry under HKEY_CLASSES_ROOT\ProgId
. HKEY_CLASSES_ROOT\.ext
. OpenWithProgid
? SHChangeNotify
after changing an association manually?