Use the integrated file browser to navigate to the folder containing the VBScript file. Highlight the VBScript file, which has a VBS extension, and click "Open" to open it in WordPad. Edit the script.

If you already have a VBScript file you want to which you want to append the new function, open it in Notepad. Create a file system object variable and open the file.

I have a vbscript that deletes a couple of .exe files on a file server and then replaces them with newer versions. The problem is that people tend to keep the files open instead of closing them ...