IBP.zip is a release file of the Minecraft mod The Impossible Became Possible., made for Minecraft 1.8.9. It was published on March 8, 2016 and is 0 MB in size. For the full description, screenshots and every other version, visit the The Impossible Became Possible. mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.