Dirty All Items Including External Files

In preparation for 2020 R1 we’re trying to come up with an automated way to dirty every object in the project so it will save with the new 2020 R1 properties. We have a number of external items that won’t get dirtied if the we do a check project and modify anything else and save. We also can’t do a SaveAs because we still have ancient RB file extensions on many files.

Anyone have a script that will dirty every project item at once and allow us to save in the newer format?