i am here for you. We know that google is so smart but we are also. Many times we have something softwares to save in our mail but it shows error because mails never can attach .exe files.
So a simple way we have. Just follow some steps-
1. Download your software which you want to attach
2. Create a .rar file of it using WINRAR.
3. Change the extension of this file from .rar to .txt
4. Then open your mailing account
5. Attach .txt file which you created
6. Now it shows no error
7. When you want to use this software,Just download it and change extension to .rar
This is a simple way to attach any extension files to mail.