What is the purpose of the Jscript code that checks for the existence of the Microsoft Office installation folder before downloading and loading the DLL?

The check ensures the exploit only runs on systems where Excel is installed, avoiding unnecessary errors or revealing intent on non-Office machines. The Jscript uses `Scripting.FileSystemObject` to test if `c:\Program Files\Microsoft Office` exists, prints a message, and only proceeds with download and registration if the folder is found. This adds a layer of reliability as described in the POC testing section of the article.