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Level 3
You can't access the file system by default. Flash Player
forces SWFs to make a decision whether they're to access the file
system or the network, but not both. Further more, if you try to
access a location that is not part of the domain from which the SWF
was loaded, you need a crossdomain.xml policy file.



To make a SWF access the file system (and only the file
system), you need to specify the mxmlc switch -useNetwork=false