Note: original document at this address: https://icculus.org/physfs/physfstut.txt, I just put some markdown markup tomake it easier to read for myself.
Here are some simple steps to getting PhysicsFS working in your program.
This tutorial was created by some friendly people in #icculus.org in the
freenode IRC network.
First thing you need to do is initialize the filesystem. You simply call
PHYSFS_init(argv[0]);
to do this.