www.openiv.com
OpenIV is a multi-purpose editor and archive manager for PC versions of Grand Theft Auto V, Grand Theft Auto IVEFLC and Max Payne 3.
Version 2.6
Today we are proud to release OpenIV 2.6. It took some time, but now you will be able to edit RPF Archives in PC version of GTA V. Currently we come with temporary solution, which requires ASI plugin for the game. When you are try to edit RPF Archive, you will see notification about installing plugin. You need to install an ASI loader and OpenIV plugin, otherwise your game will not work with modified archives. With installed ASI loader and plugin, you will not be able to go into GTA Online. This will keep you from accidently banning and GTA Online will be protected from modifications.
Besides RPF editing, we are also added support for GTA V PC files in Drawable, Collision and Navmesh viewers, so now you can view some models. As always, the full change log is available here.
Credits: OpenIV Team