Samsung (or Cingular?) didn't like the default Microsoft "File Explorer", so
they replaced it by another one they call "MyStuff".

Unfortunately "MyStuff" has a serious bug: it does not use the file
association info from the registry to determine what application should
handle each file type.

"MyStuff" has its own predefined types (i.e. it will start their custom
image viewer to view JPEG images), but for example, if you select an MPEG
file, it will start Windows Media even if you have installed an MPEG player
application associated with MPEG file extension.

I guess Samsung (or Cingular?) assumed that third-party applications are
never installed on their device.

The Microsoft "File Explorer" will correctly start the associated
application, but "MyStuff" won't.

Luckyly the Microsoft "File Explorer" is available on the BlackJack, hidden
in the "Home > Start > Applications" folder.