In the context of PS Vita homebrew and emulation, a work.bin file is a generated by the NoNpDrm plugin on a jailbroken PS Vita console.

Every work.bin is unique to a specific game's Title ID (e.g., PCSB00001) and region. How to Get the Work.bin File

When you run a legitimate game on a Vita with the NoNpDrm plugin installed, the console automatically generates a work.bin in the ux0:nonpdrm/license/app/[TITLE_ID]/ directory.

The is a critical license file required by the Vita3K emulator to decrypt and run commercial PlayStation Vita games. Without this file, or its digital equivalent known as a zRIF string , the emulator cannot "unlock" the encrypted data found in original game packages (.pkg files). What is a Work.bin File?

Download the (the game data) and the work.bin (the license). Installing Games Using work.bin in Vita3K

This is the most common method for emulator users. Sites like NoPayStation host a community-driven database of PKG links and their corresponding work.bin files. Search for your game on the NPS database.