I see this file in my DCBackup as well. (to be precise, the ones I have is called "0xf954019ad5ecd2bf410a5e8597f6982d.package")
I opened it up. Mine consists of an XML (tuning, contains stuff like "It takes 240 minutes to upgrade a stove") and an STBL (contains the names of game phrases, such as "The Jockey" or "Thank you for putting out that fire!"). The STBL references what appears to be a challenge, called Salt Water Fish Monger, which is time sensitive, and is "Silver". I assume it's an achievement.
The XML does not contain any tuning, rather it is a "manifest" which has a buch of ID Keys (which aren't useful to players without s3pe, since they are ID Keys for XML files inside packages).
If I had to take a guess, I'd assume it's the package file for an achievement.