These are the special XML files used to help with the deployment of Tinderbox project files (e.g. the packaged examples that ship with Tinderbox).
Filename Extension: n/a
Icon: A switch alongside the old Tinderbox program icon.
You are unlikely to encounter this file type directly unless you are creating packages for deploying example projects.
The normal location for the Preferences file is:
Users wanting to share Preferences between several users of the same Mac may elect to copy/move their Preferences file to:
Tinderbox checks the latter folder for a Preferences file and if found, uses it in preference to any local version.