The .sit install file for LimeWire 2.1.3 which saves to my OS X desktop opens Microsoft Word for OS X instead of running the install.

I have the latest Stuffit Expander from their website-- double checked this and reloaded it twice.

I updated Mac OS X to version 10.1.2 which perhaps presents an incompatibility problem...

Any ideas as to why Word opens from an .sit file?