QuickTime Player Windows 8,1
Dell Inspiron 15 -OTHER, Windows 8
Dell Inspiron 15 -OTHER, Windows 8
Just what it says.
QuickTime can pay a variety of file types and formats.
Some that it deems it can play are associated with a different application, or have no application associated with them.
Its simply asking if you want to change the association to QuickTime so they open with QuickTime when you double click on them, rather than with the other application they are associated with currently if any.
QuickTime Player Windows 8,1