"IOError: cannot find loader for this WMF file"

[hugovk]

From @cgohlke in #3154 (comment) and #3154 (comment).

What did you do?

Run test suite on Windows.

What did you expect to happen?

Tests pass.

What actually happened?

Tests fail and quit.

--------------------------------------------------------------------
Pillow 5.2.0 TEST SUMMARY
--------------------------------------------------------------------
Python modules loaded from X:\Python27-x64\lib\site-packages\PIL
Binary modules loaded from X:\Python27-x64\lib\site-packages\PIL
--------------------------------------------------------------------
--- PIL CORE support ok
--- TKINTER support ok
--- FREETYPE2 support ok
--- LITTLECMS2 support ok
--- WEBP support ok
--- WEBP Transparency support ok
--- WEBPMUX support ok
--- WEBP Animation support ok
--- JPEG support ok
--- OPENJPEG (JPEG2000) support ok
--- ZLIB (PNG/ZIP) support ok
--- LIBTIFF support ok
*** RAQM (Bidirectional Text) support not installed
--------------------------------------------------------------------
Running selftest:
--- 57 tests passed.


============================= test session starts =============================
platform win32 -- Python 2.7.15, pytest-3.6.2, py-1.5.4, pluggy-0.6.0 -- X:\Python27-x64\python.exe
cachedir: .pytest_cache
rootdir: D:\Build\Pillow\Pillow-5.2.0, inifile: setup.cfg
plugins: xdist-1.22.2, timeout-1.2.0, pep8-1.0.6, forked-0.2, faulthandler-1.5.0, cov-2.5.1, hypothesis-3.57.0, celery-4.1.1, backports.unittest-mock-1.3
collected 2356 items

<snip>

tests/test_file_wmf.py::TestFileWmf::test_load_raw <- Tests\test_file_wmf.py FAILED [ 73%]

================================== FAILURES ===================================
__________________________ TestFileWmf.test_load_raw __________________________

self = <test_file_wmf.TestFileWmf testMethod=test_load_raw>

    def test_load_raw(self):

        # Test basic EMF open and rendering
        im = Image.open('Tests/images/drawing.emf')
        if hasattr(Image.core, "drawwmf"):
            # Currently, support for WMF/EMF is Windows-only
>           im.load()

Tests\test_file_wmf.py:15:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <PIL.WmfImagePlugin.WmfStubImageFile image mode=RGB size=1625x1625 at 0xF872320>

    def load(self):
        loader = self._load()
        if loader is None:
>           raise IOError("cannot find loader for this %s file" % self.format)
E           IOError: cannot find loader for this WMF file

X:\Python27-x64\lib\site-packages\PIL\ImageFile.py:306: IOError
============= 1 failed, 1642 passed, 82 skipped in 50.83 seconds ==============

What versions of Pillow and Python are you using?

Pillow 5.2.0
Python 2.7.15

Notes

@cgohlke can't reproduce this outside the tests, and AppVeyor isn't failing.

[radarhere]

It's possible that this is resolved, as @cgohlke stated for 6.0.0 that all tests pass - #3618 (comment)