Mac Alpha 5 Wont Open. (SOLVED)

[Jorg]

I've just bought Rimworld, downloaded it, unzipped it and attempted to play it. However whenever I click on the Icon it appears to open it but nothing actually happens. I am aware that I may need to make the file executable but I have No idea how to go about that and would appreciate any help.
My system:

Version 10.9.3 OSX
Processor 2.7Ghz
Memory 16GB

This is really upsetting as I paid the 30$ and just want to be able to play the game. Please help.

[Jorg]

SOLVED WOOO.

I un-archived the zip previously with KEKA and just unarchived it with the archive utility on the MAC which makes it run perfectly

[StorymasterQ]

I've heard of other Mac users failing to run RimWorld because they unarchived the game with programs other than the Archive utility. Is there something weird about those other programs?