What it does
Open the game's archives, look inside every file and change them safely. SparkIV reads the files of your own copy of the game; it contains no game data.
Archives
Browse the IMG and RPF archives of GTA IV, The Lost and Damned and The Ballad of Gay Tony.
Cutscenes .cut
Plays the cutscenes with cast, camera, lights, sound and location, lit and shaded the way the game does it.
Models .wdr .wdd .wft
Models in 3D, with their textures and shaders.
Textures .wtd
View and export the textures of a dictionary.
Animations .wad
Play the animations of a dictionary.
Audio .ivaud
Listen to sound banks, including multichannel tracks, and export them.
Scripts .sco
Decompiled or disassembled mission scripts.
Collision .wbn .wbd
See the collision of the map.
Editing
Replace and import files in an edit mode. The original of every file is backed up before SparkIV first writes to it.
Get started
A legally owned copy of GTA IV or Episodes from Liberty City for PC is required.
Download
Get reditec.SparkIV-win-Setup.exe from the releases.
Install
Run it. As the app isn't signed yet, Windows may warn you: choose "More info", then "Run anyway".
Open your game
SparkIV finds the game folder or asks for it. New versions install with one click and show what's new; the channel is set in Settings → Updates.
What's new in 0.9.0 Alpha 2
Released on October 26, 2026. Mostly cutscenes looking more like the game.
- Vehicle windows are no longer drawn twice (bright streaks on car glass).
- Lamps of other floors no longer light through the floor.
- See-through lamp shades no longer glow.
- Shiny surfaces outdoors no longer mirror too much sky.
- Ceiling spots' lenses light up whole, as in the game.
- Lamps show their cones of light in the air, as in the game.
- Lamp shadows on peds' clothes follow their folds, as in the game.
- Peds' normal maps work again (folds and marks on clothes, as in the game).
- Settings → About shows the changelog; after an update SparkIV offers to show what's new.
All versions: changelog · release on GitHub
Where it's heading
Version 1.0 will be the first that fully supports GTA IV on PC:
- every file of the game opens;
- all cutscenes look as they do in the game;
- export, edit and import, compatible with OpenIV's openFormats.
Known differences from the game are tracked in the issues.
Open source
SparkIV is free software under the GNU General Public License v3.
It was started by aru in 2008 and carried on by Ahmed Walid and Silent Spud; reditec has rebuilt it as a WinUI app since 2026. Contributions and bug reports are welcome on GitHub.
