With $wgStrictFileExtensions = false, the upload page allows to upload non-image files. But there's no point-and-click way to insert the file into a page.
Is there a way to get an upload/insert button on edit toolbar, to insert non-image files?
Topic on Project:Support desk
The new Visual Toolbar seems might offer this functionality. Unfortunately my host doesn't support node.js
Without Visual Toolbar, this seems a possible option--