Actionscript 3 :: Make An Object Network Serialize To A File, Not A SharedObject?

Currently, I do serialize my model object to the SharedObject instance:

try {
var mySo:SharedObject = SharedObject.getLocal("sig");
mySo.clear();[code]....

Likewise, I load the saved model using the SharedObject instance. Works great.Ultimately, I'd like to serialize it to a file - which fails. Here is how:

var fp: File = File.applicationStorageDirectory;
fp = fp.resolvePath( PREFS_FILENAME );
var _prefsStream:FileStream;[code]....

The complementing read operation suddenly breaks and reports missing bytes.In fact, I can't image how FileStream / _model.writeExternal() is able to serialize, since it needs to somehow know, that a new serialization operation is about to start. If it doesn't know, it won't be able to determine, which object instances are left to serialize.Thus, I image that my concept is completely wrong or I missed how to initialize the serialization operation.I'd be happy to read the raw ByteArray from the shared object and write it to a file. Unfortunately, I didn't find a method to retrieve from a SharedObject a ByteArray of a certain property, in my case mySo.data.model.My question is loosely related to this one: Why does delete( DictionaryInstance[ key ] ); fail?