Newbie need Help. Iiko download trouble.

Hi, I am new to this (Animation) and need help.
I finally got the Iiko downloaded to my laptop. The main problem is that it has no extension. It is only “1326998736_Iiko” please help.

The file you downloaded is a zip archive named “1326998736_Iiko rig 3ds”. Unzip it and you get a folder called “1326998736_Iiko rig 3ds Max” that contains 5 files: 3 Max files and 2 jpegs. Double-click the one named “IikoRig.max” ( or “IikoRig” if you hide file extensions ) and it will launch 3DS Max and open the Iiko.