title: How to fix "ImportError: unable to find Qt5Core.dll on PATH" after pyinstaller bundled the python application
body: <p>Can't run QT based GUI application bundled by pyinstaller,  the console output shows it is due to an import error:</p>
  
  <blockquote>
    <p><code>ImportError: unable to find Qt5Core.dll on PATH</code></p>
  </blockquote>
  
  <p>Originally, the pyqt5/pyqt and pyinstaller is from condo. I've tried to reinstall pyqt5 and pyinstaller from pypi, but it does not solve the problem.</p>
  
  <p>I checked the pyinstaller dist dir, it contains all needed dlls. When I am in conda env(Start a conda console, then run the bundled application in the console), the bundled application runs properly. I checked the loaded dlls, all of them are in the dist dir or system default dirs.</p>
  
  <p>I'm on <code>windows 10 x64 [Ver 10.0.18362.175]</code>,  Python version is <code>3.7.3</code> from miniconda.</p>
  
  <p>conda packages:</p>
  
  <pre><code>    # packages in environment at D:\Miniconda3:    
      #    
      # Name                    Version                   Build
      altgraph                  0.16.1                   pypi_0
      asn1crypto                0.24.0                   py37_0
      attrs                     19.1.0                   py37_1
      backcall                  0.1.0                    py37_0
      blas                      1.0                         mkl
      bleach                    3.1.0                    py37_0
      bzip2                     1.0.7                he774522_0
      ca-certificates           2019.5.15                     0
      certifi                   2019.6.16                py37_0
      cffi                      1.12.3           py37h7a1dbc1_0
      chardet                   3.0.4                    py37_1
      colorama                  0.4.1                    py37_0
      conda                     4.7.5                    py37_0
      conda-package-handling    1.3.10                   py37_0
      cryptography              2.7              py37h7a1dbc1_0
      decorator                 4.4.0                    py37_1
      defusedxml                0.6.0                      py_0
      entrypoints               0.3                      py37_0
      future                    0.17.1                   pypi_0
      icc_rt                    2019.0.0             h0cc432a_1
      icu                       58.2                 ha66f8fd_1
      idna                      2.8                      py37_0
      intel-openmp              2019.4                      245
      ipykernel                 5.1.1            py37h39e3cac_0
      ipython                   7.6.0            py37h39e3cac_0
      ipython_genutils          0.2.0                    py37_0
      ipywidgets                7.4.2                    py37_0
      jedi                      0.13.3                   py37_0
      jinja2                    2.10.1                   py37_0
      jpeg                      9b                   hb83a4c4_2
      jsonschema                3.0.1                    py37_0
      jupyter                   1.0.0                    py37_7
      jupyter_client            5.2.4                    py37_0
      jupyter_console           6.0.0                    py37_0
      jupyter_core              4.5.0                      py_0
      jupyterlab                0.35.4           py37hf63ae98_0
      jupyterlab_server         0.2.0                    py37_0
      libarchive                3.3.3                h0643e63_5
      libiconv                  1.15                 h1df5818_7
      libpng                    1.6.37               h2a8f88b_0
      libsodium                 1.0.16               h9d3ae62_0
      libxml2                   2.9.9                h464c3ec_0
      lz4-c                     1.8.1.2              h2fa13f4_0
      lzo                       2.10                 h6df0209_2
      m2w64-gcc-libgfortran     5.3.0                         6
      m2w64-gcc-libs            5.3.0                         7
      m2w64-gcc-libs-core       5.3.0                         7
      m2w64-gmp                 6.1.0                         2
      m2w64-libwinpthread-git   5.0.0.4634.697f757             
      macholib                  1.11                     pypi_0
      markupsafe                1.1.1            py37he774522_0
      menuinst                  1.4.16           py37he774522_0
      mistune                   0.8.4            py37he774522_0
      mkl                       2019.4                      245
      mkl_fft                   1.0.12           py37h14836fe_0
      mkl_random                1.0.2            py37h343c172_0
      msys2-conda-epoch         20160418                      1
      nbconvert                 5.5.0                      py_0
      nbformat                  4.4.0                    py37_0
      notebook                  5.7.8                    py37_0
      numpy                     1.16.4           py37h19fb1c0_0
      numpy-base                1.16.4           py37hc3f5095_0
      openssl                   1.1.1c               he774522_1
      pandoc                    2.2.3.2                       0
      pandocfilters             1.4.2                    py37_1
      parso                     0.5.0                      py_0
      pefile                    2019.4.18                pypi_0
      pickleshare               0.7.5                    py37_0
      pip                       19.1.1                   py37_0
      prometheus_client         0.7.1                      py_0
      prompt_toolkit            2.0.9                    py37_0
      pycosat                   0.6.3            py37hfa6e2cd_0
      pycparser                 2.19                     py37_0
      pycrypto                  2.6.1                    pypi_0
      pygments                  2.4.2                      py_0
      pyinstaller               3.4                      pypi_0
      pyopenssl                 19.0.0                   py37_0
      pyqt                      5.9.2            py37h6538335_2
      pyqt5                     5.13.0                   pypi_0
      pyqt5-sip                 4.19.18                  pypi_0
      pyrsistent                0.14.11          py37he774522_0
      pysocks                   1.7.0                    py37_0
      python                    3.7.3                h8c8aaf0_0
      python-dateutil           2.8.0                    py37_0
      python-libarchive-c       2.8                      py37_9
      pywin32                   223              py37hfa6e2cd_1
      pywin32-ctypes            0.2.0                    pypi_0
      pywinpty                  0.5.5                 py37_1000
      pyzmq                     18.0.0           py37ha925a31_0
      qt                        5.9.7            vc14h73c81de_0
      qtconsole                 4.5.1                      py_0
      requests                  2.22.0                   py37_0
      ruamel_yaml               0.15.46          py37hfa6e2cd_0
      scipy                     1.2.1            py37h29ff71c_0
      send2trash                1.5.0                    py37_0
      setuptools                41.0.1                   py37_0
      sip                       4.19.8           py37h6538335_0
      six                       1.12.0                   py37_0
      sqlite                    3.28.0               he774522_0
      terminado                 0.8.2                    py37_0
      testpath                  0.4.2                    py37_0
      tornado                   6.0.3            py37he774522_0
      tqdm                      4.32.1                     py_0
      traitlets                 4.3.2                    py37_0
      urllib3                   1.24.2                   py37_0
      vc                        14.1                 h0510ff6_4
      vs2015_runtime            14.15.26706          h3a45250_4
      wcwidth                   0.1.7                    py37_0
      webencodings              0.5.1                    py37_1
      wheel                     0.33.4                   py37_0
      widgetsnbextension        3.4.2                    py37_0
      win_inet_pton             1.1.0                    py37_0
      wincertstore              0.2                      py37_0
      winpty                    0.4.3                         4
      xz                        5.2.4                h2fa13f4_4
      yaml                      0.1.7                hc54c509_2
      zeromq                    4.3.1                h33f27b4_3
      zlib                      1.2.11               h62dcd97_3
      zstd                      1.3.7                h508b16e_0
  </code></pre>
  
  <p>pyinstaller dist dir files:</p>
  
  <pre><code>    PS C:\Users\xxx\Idp\dist\main&gt; dir
  
  
          Directory: C:\Users\xxx\Idp\dist\main
  
  
      Mode                LastWriteTime         Length Name
      ----                -------------         ------ ----
      d-----         2019/7/9     15:04                Crypto
      d-----         2019/7/9     15:04                PyQt5
      -a----         2019/7/8     16:35          19208 api-ms-win-core-console-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-datetime-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-debug-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-errorhandling-l1-1-0.dll
      -a----         2019/7/8     16:35          22280 api-ms-win-core-file-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-file-l1-2-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-file-l2-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-handle-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-heap-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-interlocked-l1-1-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-core-libraryloader-l1-1-0.dll
      -a----         2019/7/8     16:35          21256 api-ms-win-core-localization-l1-2-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-memory-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-namedpipe-l1-1-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-core-processenvironment-l1-1-0.dll
      -a----         2019/7/8     16:35          20744 api-ms-win-core-processthreads-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-processthreads-l1-1-1.dll
      -a----         2019/7/8     16:35          18184 api-ms-win-core-profile-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-rtlsupport-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-string-l1-1-0.dll
      -a----         2019/7/8     16:35          20744 api-ms-win-core-synch-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-synch-l1-2-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-core-sysinfo-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-core-timezone-l1-1-0.dll
      -a----         2019/7/8     16:35          18696 api-ms-win-core-util-l1-1-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-crt-conio-l1-1-0.dll
      -a----         2019/7/8     16:35          22792 api-ms-win-crt-convert-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-crt-environment-l1-1-0.dll
      -a----         2019/7/8     16:35          20744 api-ms-win-crt-filesystem-l1-1-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-crt-heap-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-crt-locale-l1-1-0.dll
      -a----         2019/7/8     16:35          27912 api-ms-win-crt-math-l1-1-0.dll
      -a----         2019/7/8     16:35          19720 api-ms-win-crt-process-l1-1-0.dll
      -a----         2019/7/8     16:35          23304 api-ms-win-crt-runtime-l1-1-0.dll
      -a----         2019/7/8     16:35          24840 api-ms-win-crt-stdio-l1-1-0.dll
      -a----         2019/7/8     16:35          24840 api-ms-win-crt-string-l1-1-0.dll
      -a----         2019/7/8     16:35          21256 api-ms-win-crt-time-l1-1-0.dll
      -a----         2019/7/8     16:35          19208 api-ms-win-crt-utility-l1-1-0.dll
      -a----         2019/7/9     15:01         779541 base_library.zip
      -a----         2019/7/9     15:04            306 config.json
      -a----         2019/7/8     16:56        3205632 libcrypto-1_1-x64.dll
      -a----         2019/7/8     16:56        3573880 libGLESv2.dll
      -a----         2019/7/8     16:56         681472 libssl-1_1-x64.dll
      -a----         2019/7/9     15:04        1523306 main.exe
      -a----         2019/7/9     15:04           1029 main.exe.manifest
      -a----         2019/7/9     10:07         625808 MSVCP140.dll
      -a----         2019/7/8     16:35         193024 pyexpat.pyd
      -a----         2019/7/8     16:56          51712 python3.dll
      -a----         2019/7/8     16:35        3745280 python37.dll
      -a----         2019/7/8     16:56        6016632 Qt5Core.dll
      -a----         2019/7/8     16:56         440952 Qt5DBus.dll
      -a----         2019/7/8     16:56        6443640 Qt5Gui.dll
      -a----         2019/7/8     16:56        1338488 Qt5Network.dll
      -a----         2019/7/8     16:56        4010616 Qt5Qml.dll
      -a----         2019/7/8     16:56        3814520 Qt5Quick.dll
      -a----         2019/7/8     16:56         334968 Qt5Svg.dll
      -a----         2019/7/8     16:56         156280 Qt5WebSockets.dll
      -a----         2019/7/8     16:56        5574776 Qt5Widgets.dll
      -a----         2019/7/9     15:04            209 run.log
      -a----         2019/7/8     16:35          19456 select.pyd
      -a----         2019/7/8     16:56         108544 sip.pyd
      -a----         2019/7/8     16:35        1016584 ucrtbase.dll
      -a----         2019/7/8     16:35        1065472 unicodedata.pyd
      -a----         2019/7/8     16:35          87200 VCRUNTIME140.dll
      -a----         2019/7/8     16:35          81920 _bz2.pyd
      -a----         2019/7/8     16:35         125952 _ctypes.pyd
      -a----         2019/7/8     16:35          31744 _hashlib.pyd
      -a----         2019/7/8     16:35         249856 _lzma.pyd
      -a----         2019/7/8     16:35          68608 _socket.pyd
      -a----         2019/7/8     16:35         114176 _ssl.pyd
  </code></pre>
  
  <p>Loaded dlls when run in conda env:</p>
  
  <pre><code>    Process: main.exe Pid: 864  
  
      Name    Path
      kernel32.dll.mui    C:\Program Files\WindowsApps\Microsoft.LanguageExperiencePackzh-CN_18362.8.25.0_neutral__8wekyb3d8bbwe\Windows\System32\zh-CN\kernel32.dll.mui
      KernelBase.dll.mui  C:\Program Files\WindowsApps\Microsoft.LanguageExperiencePackzh-CN_18362.8.25.0_neutral__8wekyb3d8bbwe\Windows\System32\zh-CN\KernelBase.dll.mui
      user32.dll.mui  C:\Program Files\WindowsApps\Microsoft.LanguageExperiencePackzh-CN_18362.8.25.0_neutral__8wekyb3d8bbwe\Windows\System32\zh-CN\user32.dll.mui
      _ctypes.pyd C:\Users\xxx\Idp\dist\main\_ctypes.pyd
      _hashlib.pyd    C:\Users\xxx\Idp\dist\main\_hashlib.pyd
      _socket.pyd C:\Users\xxx\Idp\dist\main\_socket.pyd
      _ssl.pyd    C:\Users\xxx\Idp\dist\main\_ssl.pyd
      _AES.cp37-win_amd64.pyd C:\Users\xxx\Idp\dist\main\Crypto\Cipher\_AES.cp37-win_amd64.pyd
      libcrypto-1_1-x64.dll   C:\Users\xxx\Idp\dist\main\libcrypto-1_1-x64.dll
      libssl-1_1-x64.dll  C:\Users\xxx\Idp\dist\main\libssl-1_1-x64.dll
      main.exe    C:\Users\xxx\Idp\dist\main\main.exe
      MSVCP140.dll    C:\Users\xxx\Idp\dist\main\MSVCP140.dll
      qgif.dll    C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qgif.dll
      qicns.dll   C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qicns.dll
      qico.dll    C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qico.dll
      qjpeg.dll   C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qjpeg.dll
      qsvg.dll    C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qsvg.dll
      qtga.dll    C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qtga.dll
      qtiff.dll   C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qtiff.dll
      qwbmp.dll   C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qwbmp.dll
      qwebp.dll   C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\imageformats\qwebp.dll
      qwindows.dll    C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\platforms\qwindows.dll
      qwindowsvistastyle.dll  C:\Users\xxx\Idp\dist\main\PyQt5\Qt\plugins\styles\qwindowsvistastyle.dll
      QtCore.pyd  C:\Users\xxx\Idp\dist\main\PyQt5\QtCore.pyd
      QtGui.pyd   C:\Users\xxx\Idp\dist\main\PyQt5\QtGui.pyd
      QtSvg.pyd   C:\Users\xxx\Idp\dist\main\PyQt5\QtSvg.pyd
      QtWidgets.pyd   C:\Users\xxx\Idp\dist\main\PyQt5\QtWidgets.pyd
      sip.pyd C:\Users\xxx\Idp\dist\main\PyQt5\sip.pyd
      python3.dll C:\Users\xxx\Idp\dist\main\python3.dll
      python37.dll    C:\Users\xxx\Idp\dist\main\python37.dll
      Qt5Core.dll C:\Users\xxx\Idp\dist\main\Qt5Core.dll
      Qt5Gui.dll  C:\Users\xxx\Idp\dist\main\Qt5Gui.dll
      Qt5Svg.dll  C:\Users\xxx\Idp\dist\main\Qt5Svg.dll
      Qt5Widgets.dll  C:\Users\xxx\Idp\dist\main\Qt5Widgets.dll
      select.pyd  C:\Users\xxx\Idp\dist\main\select.pyd
      VCRUNTIME140.dll    C:\Users\xxx\Idp\dist\main\VCRUNTIME140.dll
      SortDefault.nls C:\Windows\Globalization\Sorting\SortDefault.nls
      ~FontCache-FontFace.dat C:\Windows\ServiceProfiles\LocalService\AppData\Local\FontCache\~FontCache-FontFace.dat
      advapi32.dll    C:\Windows\System32\advapi32.dll
      bcrypt.dll  C:\Windows\System32\bcrypt.dll
      bcryptprimitives.dll    C:\Windows\System32\bcryptprimitives.dll
      C_1252.NLS  C:\Windows\System32\C_1252.NLS
      cfgmgr32.dll    C:\Windows\System32\cfgmgr32.dll
      clbcatq.dll C:\Windows\System32\clbcatq.dll
      combase.dll C:\Windows\System32\combase.dll
      CoreMessaging.dll   C:\Windows\System32\CoreMessaging.dll
      CoreUIComponents.dll    C:\Windows\System32\CoreUIComponents.dll
      crypt32.dll C:\Windows\System32\crypt32.dll
      cryptbase.dll   C:\Windows\System32\cryptbase.dll
      cryptsp.dll C:\Windows\System32\cryptsp.dll
      d3d11.dll   C:\Windows\System32\d3d11.dll
      d3d9.dll    C:\Windows\System32\d3d9.dll
      DataExchange.dll    C:\Windows\System32\DataExchange.dll
      dcomp.dll   C:\Windows\System32\dcomp.dll
      igd9dxva64.dll  C:\Windows\System32\DriverStore\FileRepository\iigd_dch_base.inf_amd64_b95c9a044993331b\igd9dxva64.dll
      dwmapi.dll  C:\Windows\System32\dwmapi.dll
      DWrite.dll  C:\Windows\System32\DWrite.dll
      DXCore.dll  C:\Windows\System32\DXCore.dll
      dxgi.dll    C:\Windows\System32\dxgi.dll
      gdi32.dll   C:\Windows\System32\gdi32.dll
      gdi32full.dll   C:\Windows\System32\gdi32full.dll
      iertutil.dll    C:\Windows\System32\iertutil.dll
      imm32.dll   C:\Windows\System32\imm32.dll
      kernel.appcore.dll  C:\Windows\System32\kernel.appcore.dll
      kernel32.dll    C:\Windows\System32\kernel32.dll
      KernelBase.dll  C:\Windows\System32\KernelBase.dll
      locale.nls  C:\Windows\System32\locale.nls
      mpr.dll C:\Windows\System32\mpr.dll
      msasn1.dll  C:\Windows\System32\msasn1.dll
      msctf.dll   C:\Windows\System32\msctf.dll
      msvcp_win.dll   C:\Windows\System32\msvcp_win.dll
      msvcrt.dll  C:\Windows\System32\msvcrt.dll
      netapi32.dll    C:\Windows\System32\netapi32.dll
      netutils.dll    C:\Windows\System32\netutils.dll
      ntdll.dll   C:\Windows\System32\ntdll.dll
      ntmarta.dll C:\Windows\System32\ntmarta.dll
      ole32.dll   C:\Windows\System32\ole32.dll
      oleaut32.dll    C:\Windows\System32\oleaut32.dll
      powrprof.dll    C:\Windows\System32\powrprof.dll
      profapi.dll C:\Windows\System32\profapi.dll
      rmclient.dll    C:\Windows\System32\rmclient.dll
      rpcrt4.dll  C:\Windows\System32\rpcrt4.dll
      rsaenh.dll  C:\Windows\System32\rsaenh.dll
      sechost.dll C:\Windows\System32\sechost.dll
      SHCore.dll  C:\Windows\System32\SHCore.dll
      shell32.dll C:\Windows\System32\shell32.dll
      shlwapi.dll C:\Windows\System32\shlwapi.dll
      srvcli.dll  C:\Windows\System32\srvcli.dll
      TextInputFramework.dll  C:\Windows\System32\TextInputFramework.dll
      twinapi.appcore.dll C:\Windows\System32\twinapi.appcore.dll
      ucrtbase.dll    C:\Windows\System32\ucrtbase.dll
      umpdc.dll   C:\Windows\System32\umpdc.dll
      user32.dll  C:\Windows\System32\user32.dll
      userenv.dll C:\Windows\System32\userenv.dll
      uxtheme.dll C:\Windows\System32\uxtheme.dll
      version.dll C:\Windows\System32\version.dll
      win32u.dll  C:\Windows\System32\win32u.dll
      windows.storage.dll C:\Windows\System32\windows.storage.dll
      winmm.dll   C:\Windows\System32\winmm.dll
      winmmbase.dll   C:\Windows\System32\winmmbase.dll
      WinTypes.dll    C:\Windows\System32\WinTypes.dll
      ws2_32.dll  C:\Windows\System32\ws2_32.dll
      wtsapi32.dll    C:\Windows\System32\wtsapi32.dll    
  </code></pre>