OpenIV is a multi-purpose editor and archive manager for PC version of Grand Theft Auto IV/Episodes from Liberty city and Max Payne 3. OpenIV major features:

Grand Theft Auto IV

Creating and editing IMG archives (version 3)
Creating and editing RPF archives (version 2 and 3)
Inbuilt viewers for common GTA IV & EfLC files (text, images etc)
Inbuilt player for GTA IV audio files
Inbuilt SCO script decompiler (hight livel code generator)
Inbuilt WTD Texture editor. (Creating, Editing, properties changes etc)
Global search in all game archives and sound files
3D Placement Search
3D Viewer of models files - WDR, WDD, WFT, WPFL
3D Viewer of collision files - WBN, WBD
3D Viewer of NavMesh files - WNV
openFormats Import/Export to allow work with GTA IV/EfLC resources in 3D editors (for example, 3Ds Max).
Text based format for easy WPL editing.
Inbuilt GXT file viewer

Max Payne 3

Creating and editing IMG archives (version 4)
Global search in all game archives
3D Viewer of collision files - WBN, WBD
3D Viewer of NavMesh files - WNV
Inbuilt WTD Texture viewer
Inbuilt viewers for common Max Payne 3 files (text, images etc)
Inbuilt GXT file viewer
Inbuilt player for Max Payne 3 audio files - AWC