You can include with your post an attached file
. The file is displayed along with the post and is available for download if a viewer so chooses.
Normally, files are ZIPPED, before they are available for download. Unless the file is an image, or already a ZIP file. This saves on bandwidth, and also ensures that users viewing posts do not accidently click on an attachment that is an executable of some kind and have it run before they notice what is happening.
I've attached a file to this post. It is the notepad EXE from windows. I've also given it a caption.