This is a converter for the demo version; for the public closed beta, recompile the source code, replacing the key with "vnqvCJUHdYvVFJx1vEK9EuhpwYS2PFM3".
Usage:
zip2orc.exe ORC file
Next to the ORC file, a corresponding ZIP file will be created.
orc2zip.exe ZIP file
Next to the ZIP file, a corresponding ORC file will be created.
Then, rename the generated ORC to Data[NextNumber].orc and place it in the game directory so that the game can recognize it.
This way, you can now create mods and load your own maps in the game.
I have attached the recompiled version for the public closed beta to the message.