If you were looking to the game or add a custom "feature" to the .zip file itself (like a mod or a script), you would generally need to decompile the game's RPGMaker-based files.
: You must locate two separate halves to unlock the chest in the attic. The_Genesis_Order v.61021 - Compressed.zip
The Genesis Order v.61021 is a specific update (Chapter 29) of the adventure game by NLT Media. While "making a feature" is broad, If you were looking to the game or
: Playing through the content in this version typically advances your total game save from approximately 59% to 61% . The_Genesis_Order v.61021 - Compressed.zip