I attached two files:
bifurModel.vtk: The .vtk file I am attempting to find the centerline of using the extract centerline module. I have no issue importing and exporting this file. Here is a google drive link.
bifurModelCenterline.vtk: This is the centerline generated by the extract centerline module. I exported it in .vtk file format without compression. However, I am unable to import it back into 3D slicer or view it in any other .vtk file viewers. Here is a google drive link.