underscore "_" before compiled swf name: why?!

Hello everybody,
everytime I compile an actionscript main class the compilers add an underscore before the name of the generated swf, and I cannot undertand why!

So if my class name is Shell.as the compiled swf will be "_Shell.swf" even if in the flex compiler properties the output file name is set correctly.

What I have to do to avoid this behaviour?

See attached screenshot...



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