Although you can’t use Attacher to send unsupported files, it’s still a great free solution for those cases when someone insists on sending one to you…
Once you receive a file via iMessage, you’ll notice the blue arrow button next to the attachment. Tapping this arrow will bring up a dialogue menu that will allow you to open the attachment in iFile, or any other supported app for that particular file type.
Again, Attacher won’t let you send attachments, but it’s a great solution for opening various unsupported file types. You can find it on Cydia’s ModMyi repo for free.
What do you think?