As sibling comments stated it's common in games. A well known open source VFS library is PhysicsFS¹, previously it was called PhysFS AFAIR. ¹ https://icculus.

As sibling comments stated it's common in games. A well known open source VFS library is PhysicsFS¹, previously it was called PhysFS AFAIR. ¹ https://icculus.org/physfs/ https://icculus.org/physfs/