Is manual file caching possible in as3 from the browser?

Hi,

I am downloading large files in the browser using a swf coded in as3 that makes byte range http requests (using http://code.google.com/p/as3httpclientlib/). This lets me download the files in chunks. Is it possible to manually cache the file byte ranges to the browser cache so that I can prevent wasting bandwidth if the client has already downloaded a portion of the file on the next visit? This would essentially be a “resume download” feature.

From what I can find on adobe livedocs, flash player will not allow this because of security issues. I just wanted to double check and see if anyone knew a way to do this before I gave up on the idea.

Thanks