Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

From #kde:
[20:54] <dpalacio> Is it possible to filter files in the KDE Open file dialog as in Dolphin when one presses Control+I?
[20:54] <dpalacio> (search in the middle of file names)
[20:55] <sreich> negative
[20:55] <sreich> although it would be nice if the open file dialog would, when you are typing in the name, filter the view
[20:55] <sreich> as opposed to just autocompleting..
[20:55] <sreich> ooo, that idea sounds pretty sexy
[20:56] * dpalacio nods
[20:56] <Jucato> why not just type *foo* in the Filter?
[20:57] <Jucato> (ah doesn't filter folders)
[20:57] <sreich> dun dun dun
[20:57] <Jucato> works with files though
[20:57] <sreich> filter doesn't respond to typations, either

In short: filter by any part of the name, folders, update on typing.