Hi there :)
.vbf files are not Outlook files, at all. That is wrong. Nice link, though, i checked it out.
A .vbf file is a visual basic form, which is usually contained with a .sln wrapper (don't mind this, just thought you might be interested.
My guess is, you need the script for something in Excel, or Access, am I right? If so, here is what you do. Open the file in Word as it came to you.
Go into the program that you would like to use it in, and open the VB editor. Copy the text of that file into that editor and save your new information as a macro. This will let you execute from within an Office product.
If indeed you mean to develop a new application with this script/file, you will indeed need to download visual studio. That's a free trial download if you do a quick search on google. It won't get you far, though, as .vbf files usually represent a form of some kind, and aren't linked properly for publishing on their own.
I wish you the best of luck, and hope that this helped :)
good luck,
Rob