These
options control what files are excluded from searches...
You
can exclude files from further searching when enough matches have
been found.
You
can exclude files from searches by filtering for file dates or sizes.
You
can choose particular file extensions, such as 'sys', to exclude from
all Find and Replace operations all the time. Unless you are
technically inclined (better yet, steeped), you do not ever need to
search some kinds of files. Searching is always safe, but
searching files that mean nothing to you would slow down
operations. And replacing text in such files would be an adventure
in computer Hades. You can skip file extensions for safety in
Replace operations and speed in Find operations.