Sometimes Pro Tools benefits from having these files cleared out (after a crash/blackout etc) - Pro Tools remakes them with default settings when it is run next. PT Prefs is a utility program for Mac OSX which can delete, backup and restore various preference and support files - Pro Tools preference trashing in other words! It doesn't delete any essential system files, they are all just settings which at worst can be manually re-entered. If this is important Pete says that the previous version is still available in case of problems. Note that the page where you can check the version numbers of all your plug-ins isn’t ready yet. Pete has also added a warning for deleting plug-in list with Pro Tools Ultimate. Pete explains that 1.7.0 is an early release of 64 bit version due to issues with newer versions of MacOS. With Apple dropping support for 32-bit applications in the macOS that will follow Mojave, Pete Gates, the creator of the excellent free application PT Prefs, has been hard at work building a new 64-bit version ready for the next release of the macOS.