Just speculating here:
I'm guessing this is a GBC emulator for the Dingoo A330, and not the Gemei A330.
The date of the file included in the download is 1/10/2009. I don't think the Gemei was released until 2010.
If I have my sources correct, the A320 and the DA330 share the same components with minimal internal differences... I think somebody is passing an A320 GBC emulator as one for the DA330 by simply renaming the file A330 instead of A320.
I do not own a Dingoo A320 or Dingoo A330 so unfortunately I have no way to test the theory.