Flash :: Object Won't Recognize Query String If Set Through Mod_rewrite?

If I load an SWF with a query string at the end, like:

object.swf?this=that

then "this" is properly recognized as a flashvar within the flash object.But, if I set "this" via mod_rewrite, as in:

RewriteRule ^object$ lib/object.swf?this=that [QSA,NC,L]

then "this" is undefined.I even wrote a little PHP script to dump the contents of $_GET (changed the rewrite target temporarily), and I'm positive that the rewrite rule is working.

mod_rewrite clarification:

To demonstrate the strangeness of the problem, let me temporarily change the rewrite target to "object.php", so the rule now reads:

RewriteRule ^object$ lib/object.php?this=that [QSA,NC,L]

I created object.php in the /lib/ directory with the following line:

<?php echo '<pre>'.print_r($_GET, true).'</pre>'; ?>

Then, when I navigate to /object, I get the following output:

Array
(
[this] => that
)

This demonstrates that the rewrite rule is working as expected.Still, when I change the rewrite target back to the SWF, "this" is not recognized as a flashvar.(I'd definitely check the rewrite log to make sure, but I don't think I have access to it on the Media Temple server I'm using.)