The article describes where the AppleWorks 6.1 for Mac OS X Public Preview is installed when you update from AppleWorks 6.0.4 to AppleWorks 6.1.2

If you have North American English versions of AppleWorks 6.0.4 and Mac OS 9.1 or Mac OS X installed, the AppleWorks 6.1.2 Updater replaces your AppleWorks 6.0.4 application with an application package that contains both the version of AppleWorks 6.1.2 for Mac OS 9.1 and the Public Preview of AppleWorks 6.1 for Mac OS X.

An application package is not a single executable file, but a package of files that includes one or more executable binaries. In this case, the package contains two binaries: one for Mac OS 9.1, and one for Mac OS X.

When your computer is started up from Mac OS 9.1 and you double-click on the AppleWorks 6.app file, AppleWorks 6.1 for Mac OS 9.1 opens. When your computer is started up from Mac OS X and you double-click on the AppleWorks 6 file, the AppleWorks 6.1 for Mac OS X Public Preview opens.

Note : The ".app" filename extension is not visible when started up with Mac OS X. The file name will appear as "AppleWorks 6" when started up with Mac OS X, and as "AppleWorks 6.app" when started up using Mac OS 9.1.