Question: Can I use my controller to play GTA IV PC?

Answer: We are actively working on adding support for a larger variety of gamepads. For now here is a complete list of all controllers compatible with Grand Theft Auto IV PC: 

• XBOX 360 for Windows (Controller) 

• Wireless XBOX 360 Controller 

• Joytech 360 pad (Controller) 

• Pelican TSZ360 Pad (Controller) 

• MadCatz 360 (Controller) 

• MadCatz 360 Pro (Controller) 

• MadCatz 360 MicroCon (Controller) 

• Bigben Controller BB7201 (Controller) 

• MadCatz Arcade GameStick 360 

• Logitech Chillstream

For Title Updates later than 1.0.2.0, Direct Input support can be enabled by using the commandline -usedirectinput. The following Direct Input controllers are now supported:

Supported Controllers: 

• Logitech Dual Action 

• Logitech RumblePad 2 

• Logitech Cordless RumblePad 2 

• Saitek P2500

Supported Wheels:
Note: Controls are unmapped, user must map controls using Manufacturer's mapping software. 

• Logitech G25 Racing Wheel 

• Logitech Wingman Formula GP Wheel 

• Logitech MOMO Racing 

• MOMO Force 

• Driving Force Pro 

• Driving Force 

• Formula Force

For more information on how to enter commandline arguments please view the GTA IV readme file under the 'benchmarking' and 'commandline' sections

If you are still having issues using your particular controller, another option is to use something like http://xpadder.com/ to map the in-game commands to your device.