Hi Hager
First things first!I had to replace the HD because the previous one was full. My Grandson(IT wiz..NOW AT UNI) suggested that I replaced it with a new HD installing XP(PREVIOUS WAS 2000pro) he loaded all the required files onto the new HD......(not FS9.....that was re- installed after XP)....With 2000PRO I had no trouble installing addons
The situation now is that aircraft that I install now are actually in the FS9 aircraft folder ........I had one success after I re installed 2004 a couple of days ago and that was it!
I have tried using your method of installing(cut and paste) but because the file includes a desktop shortcut it 'plonks' the aircraft on the desktop!
Soooooo! I use a drag and drop(from fs folder into Aircraft in FS9) ....That puts the aircraft into the FS9 folder ok.........and there it stops not to re appear!!!
When I go into the Flight sim I only have the basic aircraft + the one success......I tried to get into the cfg file and it tells me that it is not supported!
I did manage to get into the cfg for Aircraft F4B-4 and it listed it as FS9\Aircraft\Beech_Baron_58\F4B-4 ........all rather confusing!!!!!
When I open the sim I USE 'CREATE FLIGHT' ...click on the top of the aircraft panel.....Select ANY....then click on the box below and scan down
My two brain cells are working overtime

and my computor skills are basic ...and I mean basic!!! it's the grey hair
Sorry about the drawn out reply ,but now you can see where I am coming from!
G7