Hello Emacs Maintainers,
Emacs 24 is great, but using openwith version 0.8f, downloaded from
http://web.student.tuwien.ac.at/~e0225855/misc/openwith.el
I get an error when opening a pdf file in dired.

See my Stackoverflow question for more info:
http://stackoverflow.com/questions/8566045/emacs-lisp-problems-with-filename-string-on-win7

Recipe:
emacs -Q
C-x d ~/.emacs.d/site-lisp/
L (with point on openwith.el)
C-x d ~/.emacs.d/org/projects/sandbox/ ;just an arbitrary pdf file
f (with point on 2test.pdf)

With M-x toggle-debug-on-error I get:
Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
  file-truename(nil)
  find-file-noselect-1(#<buffer 2test.pdf<2>>
"~/.emacs.d/org/projects/sandbox/2test.pdf" nil nil
"~/.emacs.d/org/projects/sandbox/2test.pdf" ((3328 6 . 23491) (16087 .
35227)))
  find-file-noselect("c:/Users/tj2/.emacs.d/org/projects/sandbox/2test.pdf"
nil nil nil)
  find-file("c:/Users/tj2/.emacs.d/org/projects/sandbox/2test.pdf")
  dired-find-file()
  call-interactively(dired-find-file nil nil)

Cheers
Thorsten

PS
I will be offline for 2 weeks from now


In GNU Emacs 24.0.91.1 (i386-mingw-nt6.1.7601)
 of 2011-11-22 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.1.7601
configured using `configure --with-gcc (4.6) --no-opt --cflags
-ID:/devel/emacs/libs/libXpm-3.5.8/include
-ID:/devel/emacs/libs/libXpm-3.5.8/src
-ID:/devel/emacs/libs/libpng-dev_1.4.3-1/include
-ID:/devel/emacs/libs/zlib-dev_1.2.5-2/include
-ID:/devel/emacs/libs/giflib-4.1.4-1/include
-ID:/devel/emacs/libs/jpeg-6b-4/include
-ID:/devel/emacs/libs/tiff-3.8.2-1/include
-ID:/devel/emacs/libs/gnutls-2.10.1/include --ldflags
-LD:/devel/emacs/libs/gnutls-2.10.1/lib'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: DEU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Dired by name

Minor modes in effect:
  openwith-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-x d . e m a <tab> d <tab> s i <tab> RET C-s o p e
n RET <help-echo> L y ^ p p f n n n n n n n n n n n
n f n n f n n n n n n n n n n n n n n n n n n n n n
n f C-x k RET M-x o p e n w <tab> RET f M-x r e p o
<tab> r <tab> RET

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark saved where search started
Load openwith.el? (y or n)  y
Loading c:/Users/tj2/.emacs.d/site-lisp/openwith.el (source)...done
Load: 1 file.
Openwith mode enabled
find-file-noselect-1: Wrong type argument: arrayp, nil
Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr message format-spec rfc822 mml mml-sec
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
emacsbug help-mode view cus-start cus-load doc-view easymenu jka-compr
image-mode openwith easy-mmode multi-isearch dired-aux dired regexp-opt
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel dos-w32
disp-table ls-lisp w32-win w32-vars tool-bar dnd fontset image fringe
lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer button faces cus-face files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process multi-tty emacs)