There are a few programs that will make your life a whole lot easier when you are making this. The first is Notepad++. It is a free application you can get it here - http://notepad-plus-plus.org/
Notepad++ will enable you to edit these files with ease. It is very powerful and can also be used for general text editing.The RAR Package
*You will need Winrar to extract this. If you don't already have it you can get it here (32-bit)(64-bit)
This RAR includes Email.vbs (the core or the email sending part - adapted from here
); Snapz.exe (from here)
; and Send.bat which ties all both of the previous together.
NONE of these are viruses, if your scanner tells you otherwise then it is a false positive.