The Revit.ini file contains settings that define variables, paths, recent files, and other settings for the Revit software.
Many settings do not appear in Revit.ini until their default values change. For other settings, you can add them to Revit.ini to cause a certain behavior.
Revit uses 2 versions of the Revit.ini file:
The UserDataCache folder contains default copies of files that are used to populate the user's profile, including Revit.ini. When Revit starts for the first time for a new user, it receives a copy of Revit.ini from the UserDataCache folder. Thereafter, Revit uses information from the User Profile version of the Revit.ini file.