Hi Gent. If you double-click on RAAF_Expansion_A.exe I suspect that you will find that it will install itself. You can do this with the file anywhere on your PC, it doesn't need to be in the CFS2\Aircraft folder. Follow the simple instructions as for installing any other program & go fly those missions.
As for the others, go back & read the installation tute again.*
http://www.simviation.com/acinstall.htmMake sure you understand the basic principles which are the same for all M$ sims. You have to extract the downloaded zipfiles before installing them. If you're new at this you might find the tips on my Lair useful. Click on the link to Grumpy's Lair from my sig below.
*PS. Ignore part 4 as this does not apply to CFS2. WinXP has its own onboard unzipper so you don't need WinZip.