Upgrading my Waldorf Blofeld synth with SL sampling option

So to get acces to the samples residing inside my Waldorf Blofeld:

I bought the option from Waldorffs homepage - I then had to play an attached midi file to the Blofeld to access the "Challenge Code" which Waldorff needs to activate my Samples.
So that started a longer search for the right tool to do this:
After some false starts (midiOX and anvil studio) and wrong goings (it does not help that in win7 you cannot adjust your midi player and thus win media player couldn't do the job either)
I finally came across Sweet MIDI Player and voila: install, start program load midi file press play and the display showed my challenge code.
Now I am waiting for the file from Waldorff :-(