Similar to Vice City's VCM mods and San Andreas' SAMI, 4MI has both a mod packager and a mod installer. The packager creates .4mi files which can then be distributed online, allowing other GTA IV players to download and, using the installer, add into their game. 4MI also enables modding of GTA IV without the use of a patch, which is so far what users wanting to mod the game have had to use.
You won't be able to add files that go in IMG or RPF files yet, they're still working on support for that. Until then, look out for modders starting to release .4mi mods.
How does this work?
Simply extract all contents of the zip somewhere and then run the exe of your choice.
To add mods to the list simply drag the .4mi files in the /mods/ folder.
ONLY 4MI FILES WORK!
Want to make .4mi versions of your mods to upload here? Download 4 Mod Installer from our database.