I figured it out.
Hi, I am on 10.6.2 and am encountering the same problem! How did you resolve it? I am unable to export to Excel, Filemaker locks up and I have to force quit every time. Thanks in advance for responding!!
FileMaker Pro on Intel-based Macintoshes requires that Rosetta be installed in order to export to .xls files (Excel 94-2004). Rosetta is not installed by default in Mac OS 10.6 Snow Leopard. To install it, run the Snow Leopard installer again, and choose to "Customize" the install; select only the "Rosetta" option to install it without affecting anything else on your existing system.