PPC-only preference panes don’t work on the new Intel Macs, because System Preferences launches in Intel-only mode. Sadly, this affects PathSnagger. A workaround, documented at MacFixIt, is to force the System Preferences application to run under Rosetta:
You can, however, force the System Preferences application to run under Rosetta (navigate to /Applications, click on the System Preferences icon, go to Get Info and check “Run with Rosetta”) in order to access such Preference panes on your Intel-based Mac.
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