running unsigned apps

[lhall]

Hi i just downloaded the android cab, and have it stored on my storage card, and im trying to run it, and it says "the file haret cannot opened. either it is not signed with a trusted document or one of its components can not be found. If the problem persists try reinstalling or restoring this file.


Im lost and have been trying to get this stupid thing to run for about a week now and its really starting to drive me absolutely nuts. Anyhelp is greatly appreciated.