# Unable to launch pvpython.exe from command line

**URL:** https://discourse.paraview.org/t/unable-to-launch-pvpython-exe-from-command-line/16899
**Category:** ParaView Support
**Created:** [July 7, 2025, 5:57am UTC](https://discourse.paraview.org/t/unable-to-launch-pvpython-exe-from-command-line/16899 "2025-07-07T05:57:18Z")
**Posts on this page:** 2
**Page:** 1

<div class="post-metadata">

### Author: ![Northern\_Condor](https://discourse.paraview.org/user_avatar/discourse.paraview.org/northern_condor/32/16670_2.png) [@Northern\_Condor](https://discourse.paraview.org/u/Northern_Condor)
#### Post date: [July 7, 2025, 5:57am UTC](https://discourse.paraview.org/t/unable-to-launch-pvpython-exe-from-command-line/16899/1 "2025-07-07T05:57:19Z")

</div>

Hello

I have a custom build of paraview

I have used the following from pvpython.exe to get the necessary PATH variables

```auto
>>> import sys
>>> ';'.join(sys.path)

```

However, when I want to launch pvpython.exe from command line and do

```auto
set PATH=%PATH%;C:\Users\Mike\RelWithDebInfo_Default\bin\Lib\site-packages;C:\Users\Mike\PythonModule\python-c-cpp\2. Manually created extension module\out\build\x64-Debug;C:\Python38\python38.zip;C:\Python38\Lib;C:\Python38\DLLs;C:\Users\Mike\RelWithDebInfo_Default\bin;C:\Python38;C:\Python38\lib\site-packages

```

(append the results to path)

I still can not launch pvpython from command line

```auto
Failed to load the shared library: "C:/Users/Mike/RelWithDebInfo_Default/bin/pvpythonrun.dll"
The specified module could not be found.

```

Thanks,  
Mike

---

<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [July 8, 2025, 11:57am UTC](https://discourse.paraview.org/t/unable-to-launch-pvpython-exe-from-command-line/16899/2 "2025-07-08T11:57:38Z")

</div>

I’ve never heard of `pvpythonrun.dll`. Where does it come from?