Cannot reset "Open Data With" default reader for .vtu files on Kubuntu

I am an aerospace student using SU2 for wing simulations. I accidentally checked the “Set reader as default” box for .vtu files, selecting the OpenFOAM reader. Now, ParaView skips the “Open Data With” selection dialog and attempts to force-load my binary SU2 files as OpenFOAM cases, causing a vtkXMLUnstructuredGridReader error (Line 26: invalid token).

Environment:

  • OS: Kubuntu 24.04 (KDE Plasma)

  • ParaView Version: 5.11.2

  • Installation Method: sudo apt install

Steps Taken (that did not work):

  1. Deleted ~/.config/ParaView/ParaView-UserSettings.json.

  2. Uninstalled and reinstalled via apt purge.