Edit MultiOpen.ini to add in the paths you want the program to look in for sub-directories.
Run the program, enter in the sub-directory you want to open in the paths you have configured - if they exist, they will be opened in Explorer, (I think - worked OK for DOpus).
eg. for your example MultiOpen.ini would look like this:
and you would enter 206
when you ran the program.
If you enter nothing and hit OK, all the directories in MultiOpen.ini will be opened.