1. Edit wincmd.ini: add to e.g. [Colors] section parameter RedirectSection=C:\Windows\test.ini (enter path to folder where TC have no write permissions),
2. Restart or start new TC,
3. Open Configuration/Colors and try to change something and then save...
TC warns that it can't save wincmd.ini. Hovewer, it can't save not wincmd.ini but C:\Windows\test.ini (which is used for redirection).

I think it would be much more informative if TC write correct path to INI that can't be accessed/written.