How do you set FileFilter when using FileReference.download()?

Question

I'm using FileReference to retrieve an exported CSV file from the server. The fileReference.download(url, "myFilename.csv") method call seems to be working and I can download the file.

The only problem with this is that I can't seem to be able to set the file filter. In my save dialog, the file type filter is always *.*, which is really bad. The user trying to save the file has to manually type in the .csv extension. How do I change the filter of the dialog box to only show *.csv and not *.*?

Any help appreciated.

Answer 1

Apparently, the answer is "No way to do it." as of Flex 3.5. Oh well.