some flashpayer's files contain all their data so you can play them
sh-3.1# wget http://sv.berkeley.edu/showcase/media/fish.swf
--19:57:32-- http://sv.berkeley.edu/showcase/media/fish.swf
=> `fish.swf'
Resolving sv.berkeley.edu...
Connecting to sv.berkeley.edu||:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 341,473 (333K) [application/x-shockwave-flash]

100%[====================================>] 341,473 88.82K/s
ETA 00:00

19:57:37 (84.91 KB/s) - `fish.swf' saved [341473/341473]

sh-3.1# iceweasel fish.swf
sh-3.1# ls -l *.swf
-rw-r--r-- 1 root root 341473 Jan 2 2001 fish.swf
sh-3.1# iceweasel fish.swf
but some other ones download data feeds off the Net
How could you know which files are downloaded? or how could you
reconstruct the data feed using tcpdump?