On the previous emacs 24.3 it png files display just fine with
libpng14-14.dll. On emacs 24.4.1 on windows 8, all png files give an error:
"Cannot display image: (Invalid image specification)". Other images, like
jpg display fine. I have this files in the emacs bin directory: (as you can
see i have libpng-16-16.dll)

GNU Emacs 24.4.1 (i686-pc-mingw32)
 of 2014-10-24 on LEG570

c:/Users/mario/Desktop/emacs-24.4/bin:
  total used in directory 19701 available 268668268
  drwxrwxrwx  1 mario mario    8192 03-11 11:52 .
  drwxrwxrwx  1 mario mario       0 03-28 14:28 ..
  -rwxrwxrwx  1 mario mario  590441 03-08 00:27 addpm.exe
  -rwxrwxrwx  1 mario mario  978880 03-08 00:27 ctags.exe
  -rwxrwxrwx  1 mario mario  730198 03-08 00:27 ebrowse.exe
  -rwxrwxrwx  1 mario mario 9220110 03-08 00:27 emacs.exe
  -rwxrwxrwx  1 mario mario 1021304 03-08 00:27 emacsclient.exe
  -rwxrwxrwx  1 mario mario  667492 03-08 00:27 emacsclientw.exe
  -rwxrwxrwx  1 mario mario  975457 03-08 00:27 etags.exe
  -rw-rw-rw-  1 mario mario    7168 03-08 00:27 grep-changelog
  -rw-rw-rw-  1 mario mario  532345 03-08 00:27 libXpm.dll
  -rw-rw-rw-  1 mario mario   28702 03-11 11:36 libgif-7.dll
  -rw-rw-rw-  1 mario mario  426102 03-11 11:52 libgmp-10.dll
  -rw-rw-rw-  1 mario mario 1092935 03-11 11:52 libgnutls-28.dll
  -rw-rw-rw-  1 mario mario   73994 03-11 11:52 libgnutls-openssl-27.dll
  -rw-rw-rw-  1 mario mario  175142 03-11 11:52 libhogweed-2-5.dll
  -rw-rw-rw-  1 mario mario 1070103 03-11 11:52 libiconv-2.dll
  -rw-rw-rw-  1 mario mario  122719 03-11 11:52 libintl-8.dll
  -rw-rw-rw-  1 mario mario  211760 03-11 11:36 libjpeg-9.dll
  -rw-rw-rw-  1 mario mario  184425 03-11 11:52 libnettle-4-7.dll
  -rw-rw-rw-  1 mario mario  194157 03-11 11:37 libpng16-16.dll
  -rw-rw-rw-  1 mario mario   94639 03-11 11:52 libtasn1-6.dll
  -rw-rw-rw-  1 mario mario 1121380 03-11 11:36 libxml2-2.dll
  -rw-rw-rw-  1 mario mario   79360 03-11 11:52 regex2.dll
  -rwxrwxrwx  1 mario mario  494367 03-08 00:27 runemacs.exe
  -rw-rw-rw-  1 mario mario   72192 03-11 11:36 zlib1.dll