Q:

Flash Builder 4 Release Build multiple files

When i make a release build the folder is populated with a number of swfs.  Are all these swfs necessary?  Is there a option to generate one swf? 
Thanks in advance
EDIT
The files I see are:

framework_4.5.0.18623.swf
osmf_1.0.0.16316.swf
rpc_4.5.0.18623.swf
spark_4.5.0.18623.swf
sparkskins_4.5.0.18623.swf
textLayout_2.0.0.200.swf
playerProductInstall.swf

A:

I assume you're using Flash Builder 4 and/or Flex 4 SDK and see a bunch of SWZ files is that correct?   These are framework files which can be cached by the player across multiple domains.   Through this caching, the download size of your app is smaller because all these dependencies are left out.  
If you want to combine everything to one SWF, in Flash Builder 4 open up the project properties and choose Flex build Path.   You'll see a framework linkage option.   Change it from "Runtime shared library" to "Merged into code.   This default value was changed when moving from Flex 3 to Flex 4. 
I'm not sure how to do it via command line, but I'm sure similar options exist. 
Be warned, though, this will make your SWF bigger and you won't take advantage of the framework caching options. 
Update: 
The files you're seeing are definitely Flex Framework files.   The reason they are SWFs instead of SWZs is because you are using a prerelease SDK (4.5 ) and the SWZs are not available for caching yet. 