QtCreator.db
QtCreator.ini
qtversion.xml
toolChains.xml
qtcreator
qtc-debugging-helper
qtc-qmldump
The location depends on the platform. On Linux and other Unix platforms, the files are located in ~/.config/QtProject and ~/.local/share/data/QtProject/qtcreator.
On Mac OS, the files are located in ~/.config/QtProject and ~/Library/Application Support/QtProject/Qt Creator.
On Windows XP, the files are located in :\Documents and Settings\\Application Data\QtProject and :\Documents and Settings\\Local Settings\Application Data\QtProject.
On Windows Vista and Windows 7, the files are located in :\Users\\AppData\Roaming\QtProject and :\Users\\AppData\Local\QtProject.