you don't have to extract the files into FMS. FMS can retrieve the files from anywere as long as it's not zipped.
You can also do the samething with sceneries.
Simply create a new folder and store that folder anywhere you want...desktop, external drive, SD cards...etc

if you right click..on XP..you'll see the extract option.
or you can simply left click to open the zip folder. Then just high light all the files..then drag it into another folder.
Or you can download WINZAR.

I just make a master folder and sub floders. It's easier for me to work on or alter the models.
Use NOTEPAD to open the .PAR files to adjust the model's physis.
You can also swap out the sound file (.wave) to whatever sounds to like.

You can also use Notepad to open the .scn files. Incase you want to reposition the model's starting posistion
or the pilot's posistion. I personally don't like the defualt settings in FMS.

You can simply copy and paste the files of a model..it's the same as extracting it.
or drag and drop.

Just change file path when you select load model or landscape.

Just google fms models..there's links up the wazoo

Good luck.