Some 10 years back, I was a Cakewalk user.
Now, I have a bunch of audio projects in wrk format.
But I can no longer use them (no more Cakewalk on my computer).
How can I convert these files in MIDI ? 
Is there any free available software ? 
Could I send the files to anyone, so that it be be converted ? 
Thanks in adavance.

Have you thought of downloading a demo of Sonar and see if that'll do it?

No, I haven't,
But obviously, it works!
Thanks