Variable: ff-case-fold-search

ff-case-fold-search is a customizable and buffer-local variable defined in find-file.el.gz.

Documentation

Non-nil means ignore cases in matches (see case-fold-search).

If you have extensions in different cases, you will want this to be nil.

Source Code

;; Defined in /usr/src/emacs/lisp/find-file.el.gz
(defcustom ff-case-fold-search nil
  "Non-nil means ignore cases in matches (see `case-fold-search').
If you have extensions in different cases, you will want this to be nil."
  :type 'boolean
  :local t)