Info:
Here can you find all about GTA 4 Mods, have fun!
GTA IV Xbox & PC File Editing Programs
General
OpenIV
Use this to open the GTA IV .rpf and .img files, it also lets you extract and replace files within the archives. This will be needed to edit or make your own custom mods.
SparkIV
Alternative to OpenIV and will also open up GTA IV .rpf and .img files and will let you extract / replace files.
Scripting / Coding
Notepad++
Use this to code GTA IV scripts, save them as .c or .cpp
ScoCompiler GUI v1.2
Use this to compile .c or .cpp to .sco
Sco Compressor
Use this to compress your .sco files
SCO Tool Box 1.2.7
Use this to view and edit .sco files
XMC 6.0 (The Best GTA 4 Mod Menu for Xbox 360/Pc)
Video (PC):
Download The XMC 6.0 & The Mod Loader (PC) Only for GTA IV
Video (Xbox 360):
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Download The XMC 6.0 & The Mod Loader (Xbox 360) Only for Liberty City