[Paraview] ParaView 5.4.1 opening a .vtk file

[Michael Jackson]

Can ParaView 5.4.1 open a .vtk file? I have tried and I get the dialog that presents the big long list of possible file readers. Nothing on that list seems to say "vtk" files. Odd. 

Probably "user error" but this seems like it used to work? macOS 10.13.x with the latest download from the ParaView web site.
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