The open-source emulator Vita3K relies entirely on the .pkg and work.bin combo to install commercial titles. Launch the application. Navigate to the top menu and select File > Install .pkg .
When you back up your games using tools like NoNpDrm, this work.bin file is the essential piece of the puzzle that the console looks for to verify you own the game. Without it, your backup won't appear on the Vita's LiveArea, no matter how many times you refresh it. vita work.bin