I have two issues, one fairly broad, and the other fairly narrow. Both involve limited file support.

(1) .zip
As to the broader issue, I frequently receive lengthy email attachments which are in .zip formats. This file format is not supported by Chrome, nor is it supported by Google Docs. Does anyone know of an app that will unzip a file and allow me to view on my CR-48 laptop?

(2) .igs
I frequently receive files with 3D illustrations. I would normally view these with eDrawings from SolidWorks. Is anyone aware of an app that I could use to view .igs drawings on my CR-48 laptop?