Pause a preload after a few frames

I need to grab just one frame from an external swf file.
Though, I’m not even sure if it’s possible. So, my alternative is to try preloading just a few kbytes of the .swf and use those within a container movie clip, stopping the entire file from being loaded.

Ideally, this would use very little bandwidth, as this method has to be repeated numerous times on one page, with LARGE swfs as the target. I have no difficulties with preloading the swf, but stopping the process once it’s started is not documented anywhere. Any theories?

If not, I will have to ‘open’->‘export image’ about a trillion times. So, any help has a HUGE thanks in advance…