How do deselect all the file types in indexing options?
Solution 1:
I did it with a simply AutoHotkey script:
^l::
Loop 100
Send {Space}{Down}
Solution 2:
(It is a poor dialog and an excellent example of inconsistencies across microsoft software.)
May I suggest a keyboard macro, one where you can record a macro of space bar (deselect) and down key (next item).
I have not tried these: Download.com search result: 'key macro'