Dear RAY,
Just a small query. I was trying to open a 4.5 version file in 4.4 version by converting 4.5 to neutrl and neutral file to 4.4.
But, it showed following error
"ERROR PROCESSING ELEMENT SECTION LINE#81"
While there were only 3 elements.
Can you plot what the problem was or is it not possible to go for this conversion ?

The 4.50 neutral file contains more data than the neutral file for 4.40. This "new" data must be manually removed from the neutral file if you plan on moving backward in versions.

I know the reducer element was new in 4.50, but that is the only thing that I can recall at the moment. Compare the documentation on the neutral file between 4.40 and 4.50 and note the differences. There won't be that much.