Alain. I'm using Windows ME and at my first attempt couldn't get the files to transfer - I seem to think I didn't reboot at the correct moment - I probably waited for a screen (which never appeared)asking me if I wanted to reboot. I uninstalled the song manager then re-installed and have not experienced any problem since. If it helps -
What you should see in the Technics area, when you have identified the path to your technics files are a set of icons showing piano keys in the background and a large yellow T in the foreground.
Select one Right click on it, then click on upload file. This should then show the number and name of the file together with which extensions are included (i.e. cmp seq. etc.)Click on OK and it should copy to your KN. Then, of course, you need to save it to the SD card. When you've done that, only another 3,999 more files to copy....