unable to find reader for vtu(or vtk) ||Paraview11||OS:Windows11

Paraview 11 installed on Windows 11 is unable to find a reader for vtu or vtk files.
The file size (unlike previous issues on this forum) is just a few MB. The vtk files have been generated using the vtk library in python.

A sample file has been attached.
0000.vtu (1.1 MB)

Your file is invalid and not in .,vtu format.
It is a .vti

Thanks a lot. The files were .vti but I was saving them as .vtu or .vtk.