I found a fltsim numbering mistake in the Plattsburg package. There are two number [fltsim.8] entries, making everything after the first #8 unused.
If you have Easycfg.jar it is a quick fix, as it correctly renumbers the entire list. I use it for all my renumbering, as it seems to have an unlimited quantity capability. I always combine all my repaints of a particular model into one folder, instead of having a couple thousand in the aircraft folder.

(I have a LOT of AI!)
PS I haven't been able to get ANY of the other renumbering programs out there to work on my system, except Easycfg.jar. It also checks for duplicate titles in the list, by the way.
The file name is EasyCfg.zip I don't remember where I got it, as the file does not have the avsim.diz or FILE_ID.DIZ usually in the zip if from avsim or flightsim.com. May have been Simviation.com. Anyway, it is from 2007, so it's been around awhile. Also, the readme does not have the author's name or contact info, so. It is a java program, so you must have that installed on your computer.