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Use file command in Terminal.app
$ file the-name-of-the-file
For PPC programs, you get something like
$ file /usr/bin/tile
/usr/bin/tail: Mach-O executable ppc
Normall OS X programs are actually directories, like
$ file /Applications/Aperture.app
/Applications/Aperture.app: directory
and for Universal applications:
$ cd /Applications/Aperture.app/Contents/MacOS
$ file Aperture
Aperture: Mach-O fat file with 2 architectures
Aperture (for architecture ppc): Mach-O executable ppc
Aperture (for architecture i386): Mach-O executable i386
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