If you are getting "Access Denied" message while trying to upload SWF file to SharePoint (2010), you can remove swf file extensions using commands below.
You need to run these from SharePoint power shell
Get your application
$sa = Get-SPWebApplication http://mysite.mycompany.com
List blocked files
$sa.WebFileExtensions
remove swf file extensions from blocked list
$sa.WebFileExtensions.Remove(“swf”)
update..
$sa.Update
Note: Make sure that you are using url of your windows based site.
