All files are in sysex format. You can use any MIDI / Sysex player to send the file to your Blofeld. I recommend however the excellent and simple Sysex Librarian on Mac or Midiox on PC.
A bank of 128 presets containing only pads, ambiant and FX sounds. Containing warm presets to cold PPG type sounds. This bank is perfect to build an atmosphere and telling stories...
SL extension not required.