This can be set in GENTRA menu./ I/O controls.
By default,the file ghis will be output after the calculation.You
can do Run/Utilities/GENTRA track unpacker to get the T****, H****
etc. from ghis file.
I suggest you to read the following material(a workshop of GENTRA):
PHOENICS\D_POLIS\D_WKSHP\GENTRA\WSGENTRA.HTM
photon/autoplot/viewer is OK for GENTRA
And tecplot can not be used for GENTRA directly now.