dropitem100_v1.6.X.zip is a release file of the Minecraft mod Drop Items Forever!, made for Minecraft 1.6.2. It was published on September 21, 2013 and is 0.2 MB in size. For the full description, screenshots and every other version, visit the Drop Items Forever! mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.