...
and like the rest of plugins it is automatically loaded from Tcl when GiD starts.
It addsa adds a new “meshio” entry to the Files Import/Export menu.
...
and the Tcl file meshio.tcl
calls GiD_Python_Import_File
to import of this file in the Python interpreter to define the function, and then calls the function to obtain the mesh data from the mesh file regardeless regardless of the mesh file format used.
...