The work.bin contains the keys necessary for Vita3K to decrypt the game during installation.
For some games, a text-based string called a zRif code can be used instead of a work.bin file to achieve the same result. How to Get a Work.bin File Vita3k Work.bin File
If you own a hacked PS Vita, the NoNpDRM plugin automatically generates a work.bin file when you run a game from a cartridge or a legitimate digital purchase. This can then be transferred to your PC for use with Vita3K. How to Install Games Using Work.bin To use a work.bin file in Vita3K, follow these steps: The work
When you download a PS Vita game in —the standard format used by Sony's servers—the game data is encrypted. Without a matching license, the emulator cannot read the game's contents. This can then be transferred to your PC for use with Vita3K