Modding GTA4

GTA4 PC is just out a month but we already see some great modding tools published. Not everything is perfect and useful for filmmaking but there is some great stuff out.
The most useful for filmmaking might be tools to view/edit textures and models like:

SparkIV an IMG/RPF Archive Viewer/Editor for GTA:IV

OpenIV a multi-purpose editor for GTA 4

Of course there are a lot more things that can be modded like weapons, cars, etc.
Most of those tools need Microsoft .NET Framework 3.5 installed.
More infos on modding GTA4 and tools can be found at:
gtaforums GTA4 mod tool thread
gta4 category at gtamodding.com

And don't forget modders first rule: Always backup your original files.
Happy modding.