A very grown up email. I answered it too.
If the Bjorn's program is your first choice for playing Sokoban, you should know, that you can build your own personal database of custom collections. When the program was at 2.1, it had 160 SLC files, but I build 300 SLC files and could play them normally. So I had almost double the amount of collections. But I couldn't submit them. If I would, then Kevin, Serg, Spiros sets would be a part of the program years ago.