How can I tell if my google chrome is 64 bit.. I know I can use the "file" command but where is the executable? is the .app file the executable? I'm just wondering how os-x knows how to launch the application when clicking the .app file. There must be some information that tells the OS where the binary is...app seems like it's analogous to .exe on windows but yet I can get package contents so I'm a bit confused. I tried googling but can't really find anything on how applications are launch on mac and how the OS knows where to find the executable.. This all came about because I'm thinking of building the 64 bit chromium. anyone using 64 bit chromium? is it worth building? of course I'll need to install another 4 gigs of ram if I really want to take advantage of the 64 bit.