When changing the File pattern in the Search panel to just an asterisk (i.e. *), this is not going to be remembered on the next start.

Also, if I manually set the currentFilter option in the QtCreator.ini,

[Find]
CurrentProjectFind\currentFilter=*
CurrentProjectFind\filters=*.*, *.h, *., *.cpp, *

the currentFilter line gets removed when Qt Creator is started and it then automatically picks the first one of the filters line. Also, moving the single asterisk to the front there doesn't change anything as this happens to get reordered anyway.