One thing that you may encounter when attempting to use the FileStream Class in Apollo is that it does not resolve to the correct package.

For instance, FileStream is mistakenly located in the flash.events namespace but is actually defined in the flash.filesystem namespace. This creates a problem when you try to import FileStream in the Eclipse IDE as intellisense will not locate the class. However, FileStream does not resolve to flash.events. FileStream and you will get a compiler error if you attempt to import flash.events. FileStream, even though intellisense will find it.

So the solution is to simply import flash.filesystem.FileStream as it is intended to resolve to this package even though you will not see it using intellisense. This is a weird bug that can leave you scratching your head for awhile so I thought I should mention it here.

Remember that this is just the initial Apollo Alpha and I am sure that this bug will be addressed in the next release.