You could just handle all files, then once the file is selected verify it's 
valid, displaying an error if it's not.

See:
- <mach-o/fat.h>
- <mach-o/loader.h>
- 
http://developer.apple.com/mac/library/documentation/DeveloperTools/Conceptual/MachORuntime/Reference/reference.html

Kevin


On Aug 25, 2010, at 10:46 AM, John Johnson wrote:

> Hello. I'm implementing an NSDocument-based utility that loads mach-o files 
> and displays information about them. But no matter what UTI I put in the 
> Info.plist, I can't get the app to recognize the file when dropped on the 
> dock tile. The only way I could get it recognized is by having no UTI and a * 
> for the extensions, but this has the (very) unfortunate side-effect of 
> recognizing ALL files. I've tried com.apple.mach-o.binary and 
> public.unix-executable as well as public.executable. It's curious, because 
> running mdls shown no UTI for an executable...
> Can anyone tell me the best way to go from here, so that my app recognizes 
> ONLY mach-o files? Is UTI's even the best way to go?
> 
> Thanks,
> John_______________________________________________
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