Certain results can be saved directly to a MapInfo TAB (DAT) file or a Shape (DBF) file. This is done by writing directly to the files, which is very fast. This method however requires, that a few issues are taken care of:
1) The output file needs to contain a field of type decimal(11,3)
2) Exclusive access to the file is needed.
Especially 2) can give trouble in MapObjects and ArcGIS for instance, while both MapInfo and ArcView 3 closes all files, while not re-drawing.
If it doesn't work, use methods ResultGetLink / ResultGetNode instead of the ResultSave functions.
Output from RW Net can be done directly to result files with these methods: IsoCostSave, ResultSaveLink, ResultSaveNode and RouteSave.