Posted: 06-15-2017 02:20 PM
Source: https://www.psxhax.com/threads/vitab...-ps-vita.2389/
Summary:

VitaBooks is a manual or book reader in PNG images. The software will create a directory named book and inside you will put your books or manual in the following ways:
  • book->VirtualTennis->image1.png,...

VitaBooks: Manual / Book Reader Homebrew App for PS Vita