Hello.  I looked this problem up and it seems like others have had it happen to them.  I ran a search on about 200 html files in a directory for a simple text search string 'google'.  I do not have regular expressions checked and I am using version 4.1.2.  Notepad crashes.

I noticed than when I click off the search subdirectory checkbox that the search does not fail.  I have subdirectories in the folder I am searching. 

Thanks,

j.