FSS does indeed scan scripts but only those related to files on your computer and not Web page scripts which is what the Script Shield does, There is a difference. The scripts that FSS scans are file related. What you read below are the scripts that FSS scans.

Description of Windows Script Host (WSH)

WSH is a language-independent scripting host for 32-bit Windows platforms. Microsoft provides both Microsoft Visual Basic Script and Java Script scripting engines with WSH. It serves as a controller of ActiveX scripting engines, just as Microsoft Internet Explorer does. Because the scripting host is not a full Internet browser, it has a smaller memory footprint than Internet Explorer; therefore, WSH is appropriate for performing simple, quick tasks. Scripts can be run directly from the desktop by double-clicking a script file, or from a command prompt. WSH provides a low-memory scripting host that is ideal for non-interactive scripting needs such as logon scripting, administrative scripting, and so on. WSH can be run from either the protected-mode Windows-based host (Wscript.exe), or the real-mode command shell-based host (Cscript.exe).

http://support.microsoft.com/kb/188135

I believe that FSS will also scan scripts located in *.PDF files on your computer.