How to install appcelerator titanium on ubuntu 12.04?

view story

http://askubuntu.com – I downloaded the available zip file which -from its name- seems to be gtk, and when trying to run TitaniumStudio as explained in the installation guide run the TitaniumStudio executable I get this error msg There is no application installed for executable files. Do you want to search for an application to open this file? I don't know how to get titanium studio up and running as the instructions isn't clear enough!! (HowTos)