Apparently, if you have 50 000 scenery files , the chances are good
that there will be a few bad apples amongst them. Files that are corrupt ,
or in a different bgl version than what I could find in the FS2002 SDK .
Let's just say that NDBfreak cannot read them.
This update will keep track of those 'unreadable' files and keep processing
the readable ones ( the previous version stopped processing files )
At the end of the scan, a list of unreadable bgl's will be available.