[temprature]

If you think a preimage attack against MD5 is "trivial" you should demonstrate it. People would be very interested in this because no one has managed to do it yet.

Creating two files with the same MD5 is a very different beast from creating a file with the same MD5 as an arbitrary pre-existing file. These third parties would need to have colluded with the DragonFly developers to make what you're proposing possible.