A lot of my customer base still uses Flash 9. Was trying to determine that if 
Flash 10 was loaded I would conditionally provide a feature in my app to save 
something to a file. I tried faking out the compiler by doing something like 
this.

if (isFlash10) {
var f:Object = new FileReference();
f.save("xyz",null);
}

but I get an error when I run it in Flash 10. Everything I found leads me to 
believe that I need to compile for Flash 10. However, I fear that will mess up 
my Flash 9 users.

Does anyone have any advice on making a SWF that will work in 9, but optionally 
use Flash 10 features.

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