diff --git a/sympy/printing/preview.py b/sympy/printing/preview.py

index 52085e5e19..f9b1d2dd5c 100644

--- a/sympy/printing/preview.py

+++ b/sympy/printing/preview.py

@@ -27,12 +27,12 @@ def _check_output_no_window(*args, **kwargs):

 def _run_pyglet(fname, fmt):

     from pyglet import window, image, gl

     from pyglet.window import key

+    from pyglet.image.codecs import ImageDecodeException

-    if fmt == "png":

-        from pyglet.image.codecs.png import PNGImageDecoder

-        img = image.load(fname, decoder=PNGImageDecoder())

-    else:

-        raise ValueError("pyglet preview works only for 'png' files.")

+    try:

+        img = image.load(fname)

+    except ImageDecodeException:

+        raise ValueError("pyglet preview does not work for '{}' files.".format(fmt))

     offset = 25