Is there a way to use a blacklist FileFilter instead of a whitelist for uploading files in flash?

Question

When using the code below for uploading files, is there a way to make the file filter exclude the files I want, and include every other file type? I looked through the adobe flash documentation but I could not find a way to do this.

var imageTypes:FileFilter = new FileFilter("Images", "*.jpg; *.jpeg; *.gif; *.png");
var textTypes:FileFilter = new FileFilter("Documents", "*.txt; *.rtf; *.pdf; *.doc");

Thanks for any help!
Metropolis