actually, .SIM emulators can be placed in any folder of the internal memory. just remember to "update jukebox" when you put a new emulator, and it should work ok.
Ohboy must not be placed in games folder. The ohboy folder must be placed in the root of the internal memory. Otherwise, it will freeze your dingoo when you try to save any settings, BMP borders will not load, and savegames/savestates will not work.
As the previous post said, zip files are used by CPS1 emulator. But you can load zip files from ohboy's internal menu.
Just remember to have at least one unzipped rom to launch the emulator.
I can try to add support for launching from zipped games (obviously with the extension renamed to something like gbz) for the next release, though.
Ok, it's done. Next release (20120119) will support launching zipped roms with extension changed to GBZ.
Both GB and GBC zipped games can be loaded with GBZ extension. Internal menu will also support this format.