When using Bentley StormCAD in MicroStation mode, there are three files that fundamentally define a Bentley StormCAD model model:

• Drawing File (.DGN)--The MicroStation drawing file contains the elements that define the model, in addition to the planimetric base drawing information that serves as the model background.
• Model File(.stsw)--The model file contains model data specific to Bentley StormCAD , including model option settings, color-coding and annotation settings, etc. Note that the MicroStation .dgn that is associated with a particular model may not bave the same filename as the model’s .stsw file.
• Database File (.MDB)--The model database file that contains all of the input and output data for the model. Note that the MicroStation .dgn that is associated with a particular model may not bave the same filename as the model’s .mdb file.

To send the model to another user, all three files are required.

It is important to understand that archiving the drawing file is not sufficient to reproduce the model. You must also preserve the associated .csd and .MDB files.