As you were told in the CB already, you gave no reason why you can't use MIME::Lite. Until you give us more explanation of why you can't use it, please see the following links which all provide avenues for satisfactory solutions:

1. A guide to installing modules for Win32
2. Sending attachments in emails using SMTP - this is somebody who wants to solve the same problem you have

Basically, you can always cut'n'paste all of the code of MIME::Lite into your program and it will be just the same as if you had MIME::Lite installed. So you'll have to work more to convince us that MIME::Lite is not the solution for you.