Now when a simulation is running in Abaqus 6.7 the files that will appear have the extensions: .stt, .msg, .odb, .sta, .res, .dat, .mdl, .log, .lck, .023, .prt, .cid, .com, .inp, and sometimes .fil depending on the simulation. The file name will be the same for all the extensions. When the simulation is over the .lck, .cid, and .023 files will disappear. That's all there is to it. Either you have those three files or you don't.