To restart an analysis, various files that were created by the previous analysis must be available in the directory from which you started the ABAQUS/CAE session.
ABAQUS/Standard
Output database (.odb)
Restart file (.res)
Model file (.mdl)
Part file (.prt)
State file (.stt)
ABAQUS/Explicit
Output database (.odb)
Restart file (.res)
Model file (.mdl)
Package file (.pac)
Part file (.prt)
State files (.abq and .stt)
Selected results file (.sel)