i downloaded some adons from the realflight webpage.i have the g2 full not the light.i installed them in the program after first putting in temporary files.i do this all the time with files like americas army update.now up too 1.6 with no problem but with this i get a box saying that windows cannot read the file and needs to know which formate to read with.anyone help.thank you in advance for info.

someone must know how please

Sounds to me like you have to copy the file or extract it to your c:\program files\realflight folder to make em work. If not try the realflight website.
I think if you try to open the files in windows it doesn't know what to do with the files and that is your message that pops up.