You can view the file with TopScan, repair it, pull it into the dictionary, but don't change any fields or keys in it or it will be unusable by the BoTran classes.

BTSubF        FILE,DRIVER('TOPSPEED'),NAME(BoTranSubFilename),PRE(BTS),BINDABLE,CREATE

KeyDefText       KEY(BTS:DefText),NOCASE,PRIMARY

Record           RECORD

DefText            STRING(256)

SubText          CSTRING(256)

               END

               END