Comment 3 for bug 1659027

I can confirm this on windows 7 pro as well. Another interesting thing is that the .STP extension does not work either. I'm a bit surprise the case of the file extension made a difference. Only the .stp extension seems to work correctly on windows. I haven't tested it on Linux yet.

Application: kicad
Version: (2017-01-25 revision 976d9fc)-master, release build
Libraries: wxWidgets 3.0.2
           libcurl/7.51.0 OpenSSL/1.0.2j zlib/1.2.11 libssh2/1.8.0 nghttp2/1.18.0 librtmp/2.3
Platform: Windows 7 (build 7601, Service Pack 1), 64-bit edition, 64 bit, Little endian, wxMSW
- Build Info -
wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.60.0
Curl: 7.51.0
KiCad - Compiler: GCC 6.3.0 with C++ ABI 1010
        Settings: USE_WX_GRAPHICS_CONTEXT=OFF
                  USE_WX_OVERLAY=OFF
                  KICAD_SCRIPTING=ON
                  KICAD_SCRIPTING_MODULES=ON
                  KICAD_SCRIPTING_WXPYTHON=ON
                  KICAD_SCRIPTING_ACTION_MENU=ON
                  BUILD_GITHUB_PLUGIN=ON
                  KICAD_USE_SCH_IO_MANAGER=OFF
                  KICAD_USE_OCE=ON